Your parcel is due for delivery by DPD . . .

[stockhausen]

. . . between 12:29 and 13:29 on Saturday . . .

Why?
In God's name, why are delivery companies always so precisely vague?
What is wrong with "between 12:30 and 13:30"?

 

[stockhausen]

Haven't you got better things to get on with?

Every minute counts mate, I have a great many much more important things to get on with!

Who knows what I might be doing at 13:30?

I should imagine that the time for all travelling and stops has been calcualted, and yours has been estimated at 12:59 (or possibly 12:44), and the system has been set up to advise the window with 30mins padding either side (or 15 before, 45 after), the same window might be used to produce scores for the driver on how well he is meeting his targets. if the window came out as between 12:32 and 13:32, he might not be happy if he last too minutes because the system rounded down to 13:30

I take your point but in my experience, :29 or :59 is ALWAYS quoted - WHY?

 

[stockhausen]

They're taking half an hour either side of the predicted route planned arrival time to give them the best chance of landing in that window.
I can't believe I'm even having to explain this

No, I can't believe you aren't explaining it either.

The point, which most people seem to be missing, is why invariably one minute before the hour or the half-hour - your experience may differ - mine doesn't.

 

[stockhausen]

. . . Seriously

No
Seriously
Read (and try to understand) my posts, it will do you good.

 

[stockhausen]

Bet your wifes a happy women

If you are selling . . . not very likely pal.

ps - after your Ninja Edit; English, do you speak it?