If you were responsible for a U.S. post office branch, and if you wanted to run a daily maintenance process on the self-service postage machines, would you run it
a) on each machine separately, or
b) on both machines at the same time?
Would you run these processes
a) late, late at night, say between 1:30 and 3:30 AM, or
b) in late evening, say around 10:30 PM?
If you guessed b) for both questions, you'd better be guessing, because if you're the incompetent fool who actually made these decisions, you're an idiot.
Because what's less effective than a "24-hour" self-service kiosk that is down for "daily maintenance" at the same time as the other one in the branch?
Besides Congress, that is.