G6 questions.

I jus switched over from a Dexcom G5 to the G6. It hasn’t asked me to calibrate at all so I’ve just been doing it manually. Do you usually get alerts?

Also, is there a way to extend the wear of one sensor like you could the G5 by just starting another 2 hour warm up with the same sensor on?

Does it have to be put on the stomach, or can I use it reliably on my upper buttocks and still get reliable numbers?

Thanks in advance