Can i say something
The biggest difference I've seen in letting it sit indoors or out for hour(s) is that it seems a bit deeper in colr , especially dark colors, yet a few customers with white or silver have said waiting also gives them a glossier look to their paint.
I also believe by wiping in on and the off with no time waiting will give a great look, but will not give the product ample time to set up unless using in the hot sun which will reduce the flash time.
Quick story...on my dark green Tahoe I had applied EX on the hood about 20 minutes previous and my wife came out and said we had to take the twins for a nap ride ...I told her I had put EX on part of the hood...she looked at me and said we have to go....so it was 90+ degrees out and we load the kids and off we went with the EX on the hood...we drove for an hour and then stopped at a Walmart...(needed some of those tiny spray bottles for QD+ use...Natty's idea) ..when we got there the kids were sleeping and I took a mf rag and proceeded to wipe it off with no effort...the shine was great.
Another day i put some on my Black 442 in the garage and left it overnight...not only did it wipe off easily but it had a better shine and glow
Now i also tried leaving it on my Bronco(no clearcoat) overnight outside...what i found were morning dew spots, but an awesome shine...had to apply another coat during the day to remove the spots..
So overall I think an hour is sufficient, 10-15 minutes in the sun, or overnight indoors will all give a great shine and let the product
set up for protection.