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Some breaks are mandated by the FCC for station identification. These “Hard Breaks” are at the same time on all stations.
I don't know the specifics of commercial broadcast radio, but I know with ham radio hams are required to identify every 10 minutes while they're transmitting including automated repeaters that will usually do it in Morse code
If you listen to some ham radio communications (sometimes it's interesting, but usually it's just old guys talking about antennas) every 10 minutes the repeater will beep out a bunch of Morse code and everyone rattles off their call signs
For commercial radio I think it's every hour so at least that often they'll have to cut to "you're listening to WXYZ 99.9 FM blah blah blah" which also provides a good segue to a commercial break.
I'm sure most of them probably just schedule that at the top of the hour to make it easy for themselves
How do I get into HAM radio cheaply and legally?
Theoretically, that's all you need. It's possible to use certain internet linked amateur transmitters for no cost as long as you have a valid callsign. However, I promise it's a lot more fun with a real transceiver. You can buy a bare minimum, highly hackable handheld VHF/UHF transceiver for as little as $20.
Or you can slowly give your soul to the moneypit of HF equipment...