I asked them: twice a day, 10 minutes each. No need to put too much pressure, that is, no need to make yourself uncomfortable during practice. Weight loss & less snoring should appear within a few months ;)
I just made a test with one of the AI:
It seems there is some evidence in there, sounds like mainly you are strengthening the muscles around your throat with that technique and this then can reduce sleap apnea a little bit.