People tend to check in during these times:
The most quiet and peaceful post office I'd ever been to in my life.
it was a profound experience bordering on the mystical
There's always at least one cranky old dude customer in the place, but IME the folks who work there are helpful.
Worst line I've ever seen. 10 people in front only 1 clerk working the counter.
This is a disaster.
If the post office was run by Starbucks employees there would never be lines out the door. Yeah I said it.
Long wait, use the automated processing center if you can. Media mail is ONLY available at the counter
Avoid at all costs. Underfunded and understaffed.
Beat the rush or cry!
One clerk helping the same person for 15 minutes means a line out the door.
Avoid the lunch and after-work rush if you can. If you're dropping off a postmarked package, take it right to the counter. No need to wait!
Automated Postal Center beats long line, yes! Priority Mail: Remember to distinguish between Flat Rate and Rate by Weight, so use the appropriate box.
Use the Automated Postal Center for self service.