@Parallax982, I do so admire your enthusiasm! Let us know how it goes, and should you seek answers to most if not all of the questions you've already asked, they are more than likely waiting for you in the sticky thread that is quite long, hence few these days like to go there.
That said, you might heed the cautions by
@Lou G and
@chaz (above) that exposure longer than 10-15 minutes does
not give better results (verified by scientific method, observing groove cleanliness with a microscope.....again, see
@Lou G post). Further, as already mentioned, longer exposure can increase risk of damage. Since you're "adequately motivated"

you might run the following test for yourself to see exactly what the cavitation process does by taking a piece of aluminum foil and suspending it in the tank while the transducers are active. After a few minutes, (in my experience, at least 3 and sometimes up to 10) of "cleaning" the aluminum foil, remove it and tell us what you see......it might provide you with valuable insight about how long to leave your favorite records in the bath. I know you said you will be doing your "experiments" using records you don't care about, and that is fine. Otherwise, though, it might be advantageous to tap into the work already done in the spirit of "do no harm....." Carry on, amigo.
PS - There is a caveat I'll mention for reference.....there have been times when I have run records through a cleaning cycle more than once, sometimes up to 3 times but not until after I've played them to see if the grooves were clean. There have been a couple where whatever the substance stuck in the grooves was so stubborn that it took repeated cleaning cycles to finally get rid of it. But again, never leaving the record in the cleaner for more than 15* minutes at a time (*that's just been my method, rather than 10 as mentioned to be adequate). You will also notice that as the cleaning process goes on, the temperature in your bath will rise from the heat which the transducers generate, without the heater even being on.....that, too, can damage (warp) records so just be aware......that is, keep an eye on a reliable thermometer as you go. Test the tank's thermometer(temperature display generated) with a known to be good, reliable thermometer so you know exactly where you are. I consider this to be important.
You're not having
any fun yet, are you!!!