20 hours overtime a week. Must make pretty good scratch.
There are city bus drivers who do that and take home 6-figure salaries.
The USPS as a matter of routine to cope with their deficits does not allow any carrier to regularily collect over-time pay. Once upon a time, a long time ago, this did happen, but the Postmaster who engages in this practice these days is going to be in trouble with his boss.