Genie Plus?

Going to Disney for the first time in awhile, during spring break so I'm definitely going to be using genie plus and buying ILLs, I have been doing my research but have a few questions

1) when making a reservation when does the 2hr rule begin, does the timer start as soon as the park opens, or after I make my 2nd reservation?

2) If I book a ride with say a 930am return time, does the 2 hour rule start after the park opens or after I make my second reservation after my 930 tap?

3) does anything reset the 2 hour timer?

4) if I snag a reservation for a ride around 11 am for a 530 return time, if I am able to modify that reservation to let's say a 12pm return time, if I ride that ride does my 2 hour timer reset because I'm able to make a new reservation, or does thst inital 2 hour time keep going and as long as I can tap in to lightning lanes I csn keep reservation

if that makes sense idk if I worded the question correctly lol thanks