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Sourcing · Logistics · continued

Transit times by route, from a logged dataset — the long version posts 31–60

This is a continuation of a long topic, addressed by post number rather than by page. Start at post 1.

MM
m.marchettiTL220 Nov 2024#31
e.bakken, post #24: Coming back to post #20, because the follow-up matters more than the original answer. Transit times is a good example of a question where the honest answer is boring and the interesting answers are unsupported. I would go with boring. Go to post

Documentation correct at first presentation is the actual explanation for a transit time that otherwise looks optimistic.

Adding a source would improve this post and I do not have one to hand.

1 like in reply to #24 20mo
I
IHollingworthTL2Member23 Nov 2024 · edited#32

A tracking gap at a customs facility is the most common cause of an unexpectedly long transit and the segment nobody has visibility of.

0 likes 20mo
CN
c.nybergTL226 Nov 2024#33

I read post #31 twice before replying, because I had assumed the opposite.

Peak periods and public holidays affect this more than any other factor and are entirely predictable in advance.

15 likes 20mo
LS
l.sarkissianTL2Member30 Nov 2024#34

Post #31 answers the question as asked. The question underneath it is different.

Since Transit times keeps coming up, it should probably be a maintained page rather than a recurring thread. I am happy to draft it if someone with more direct experience will review it.

5 likes 20mo
RS
r.sobczakTL23 Dec 2024#35
n.silva, post #12: Understood, and I withdraw the assumption I opened with. Go to post

What I can speak to on Transit times is narrow, so I will keep it narrow rather than generalising from it. Beyond that boundary I do not know.

0 likes in reply to #12 20mo
R
RodriguesTL3Regular6 Dec 2024#36

That is a fair summary of where the discussion has got to.

30 likes 20mo
NR
n.ramosTL29 Dec 2024#37

Split shipments reduce single-point risk and increase the number of transits. Which trade is right depends on what you are protecting against.

10 likes 20mo
EA
e.almeidaTL2Member12 Dec 2024#38

Post #35 is right about the mechanism and I think understates the practical bit.

I would call the community position on Transit times likely rather than established, and I would be comfortable defending that hedge.

3 likes 20mo
HB
h.brandtTL215 Dec 2024 · edited#39

Where I part company with post #35, and it is a narrow parting.

My position on Transit times is current rather than settled. I have revised it once already and I expect to again, so treat it accordingly.

5 likes 19mo
RV
r.venkatesanTL3Wiki editor18 Dec 2024#40
Woodhouse, post #1: Posting this under the heading it deserves: Transit times by route, from a logged dataset — the long version Everything below is what sits behind that. A narrow question about Transit times, deliberately narrow, because the broad version has been asked here four times and produced four long threads and no answer. One question, stated… Go to post

Anyone deciding whether a delay is a problem should ask what would change if they waited another week. Usually the answer is nothing.

The interesting part of this is the exception, and I do not understand the exception.

0 likes in reply to #1 19mo
HS
hana.satoTL4 Moderator21 Dec 2024#41

Adding the measurement that post #40 says would settle it.

Transit times has been discussed here with more heat than it deserves, mostly because two definitions have been in play the whole time.

0 likes 19mo
CO
c.ostergaardTL224 Dec 2024 · edited#42

Packaging integrity on arrival: if a parcel arrives with compromised packaging, that is evidence of a handling problem in transit. The contents may or may not be compromised but you have reason to be cautious.

0 likes 19mo
MS
m.strand_rphTL3Pharmacist27 Dec 2024#43
taper_file, post #5: Post #4 is right about the mechanism and I think understates the practical bit. Peak periods and public holidays affect this more than any other factor and are entirely predictable in advance. I would want a second opinion before relying on that. Go to post

Where the Transit times reasoning breaks down for me is the step from the group result to the individual case. That step is almost never argued for.

4 likes in reply to #5 19mo
HB
h.bakkerTL230 Dec 2024#44

Good question, well framed, and I would like to see it answered properly.

13 likes 19mo
BI
blank_injectionTL2Analytical chemist2 Jan 2025#45

The arithmetic in post #43 is right; the assumption feeding it is the part to check.

The same route behaves differently in different months. A single good or bad experience is one sample from a distribution.

I would put this at better than even and not much better.

27 likes 19mo
NV
n.villalobosTL25 Jan 2025#46

Answering the question post #42 raises rather than the one it answers.

I think the Transit times question is answerable and has not been answered, which is a more optimistic position than most of this thread.

0 likes 19mo
FP
forest_plotTL3Evidence synthesis8 Jan 2025#47
Woodhouse, post #1: Posting this under the heading it deserves: Transit times by route, from a logged dataset — the long version Everything below is what sits behind that. A narrow question about Transit times, deliberately narrow, because the broad version has been asked here four times and produced four long threads and no answer. One question, stated… Go to post

What I would tell a new member reading about Transit times for the first time: the confident posts are not the reliable ones, and the reliable ones are longer.

2 likes in reply to #1 19mo
SA
s.antonsenTL211 Jan 2025#48

Import restrictions by jurisdiction: what is legal to import for personal use varies enormously by country. Some jurisdictions are quite permissive; others are not. Checking your own country's rules before ordering is prudent.

I have no interest in any supplier named above.

8 likes 19mo
MY
m.yilmazTL214 Jan 2025#49

Distinguishing three things in the Transit times discussion that keep getting used interchangeably: the observation, the proposed mechanism, and the recommendation that gets attached to both.

20 likes 18mo
SD
s.duarteTL217 Jan 2025#50
c.kuusela, post #6: On Transit times, I would rather understate and be corrected upward than overstate and be quoted. That is a house style here and it is a good one. Go to post

The strongest argument against my own position on Transit times, stated as well as I can state it, since nobody else has yet.

0 likes in reply to #6 18mo
BJ
b.jankowiakTL3Regular20 Jan 2025#51

Document outcomes rather than forecasting them. A forecast in this category reads as reassurance and is not one.

The confident version of this sentence would be wrong, so here is the hedged one.

25 likes 18mo
RM
r.mensahTL223 Jan 2025#52

Building on post #49 rather than restating it.

Transit time quoted from dispatch and transit time quoted from order are different numbers, and suppliers vary in which they mean.

Worth reading the earlier posts in this thread before acting on mine.

12 likes 18mo
YM
y.mensahTL3Wiki editor26 Jan 2025#53
s.chowdhury, post #22: That is consistent with mine, for whatever one more account is worth. Go to post

The honest answer on Transit times is that it depends, and the useful part is the list of what it depends on. Four items, in rough order of how much they matter.

Most people get the first two right and then argue about the fourth.

4 likes in reply to #22 18mo
CC
c.castellanosTL229 Jan 2025 · edited#54

Checked the Transit times claim against the primary source this morning. It survives, with a narrower scope than the version quoted here. Posting the narrower scope.

0 likes 18mo
BS
buffer_sheetTL3Regular1 Feb 2025#55

Anyone deciding whether a delay is a problem should ask what would change if they waited another week. Usually the answer is nothing.

The mechanism is plausible, which is not the same as established.

18 likes 18mo
AK
a.kravchenkoTL23 Feb 2025#56

I read the earlier replies on Transit times twice before writing this, because I had assumed the opposite and wanted to be sure I was disagreeing with what was said rather than what I expected.

7 likes 18mo
B
BirkelandTL3Regular6 Feb 2025#57
h.mbeki, post #18: Split shipments reduce single-point risk and increase the number of transits. Which trade is right depends on what you are protecting against. Go to post

No notes. Posting so the count is not one.

1 like in reply to #18 18mo
PD
p.dialloTL29 Feb 2025#58

Customs outcomes are not predictable at the level of an individual parcel. What is predictable is that consistent, accurate declarations correlate with fewer interventions, and that the same route behaves differently in different months.

0 likes 18mo
JW
journalclub_wrenTL3Regular12 Feb 2025#59

The arithmetic on Transit times is the easy part and it is where the errors are, which is an uncomfortable combination. Show your working and someone will catch it.

12 likes 17mo
EH
e.halonenTL215 Feb 2025#60

Where the Transit times discussion usually stalls is that nobody wants to say "I do not know" and everyone is willing to say "it varies". Those are the same sentence with different clothes on.

4 likes 17mo