They won't.
Markups are calculated at 25.4 seconds per bundle. Each bundle is 680 mail pieces, rounded up.
So if your route received 2000 mailpieces, regardless of the number of markups:
2000 / 680 = 2.94 --> round up to 3
3 * 25.4 = 76.2 seconds for the day
See
here for a calculator
The
unsavvy carrier will handle all markups at their case, in the morning, for free, while they case DPS, for free.
The
savvy carrier will handle markups as paid actual time, during End of Shift Duties:
dispose of undeliverable ordinary mail.