Nobody is waiting three hours. Just fill the tires to 45psi and don't overthink it. Personally, I keep the car status or whatever it is visible on my IC at all times. This is one of most important things to monitor on any car but especially on these cars. I also know that, at my elevation, my readings will be about 2.5psi low from what it actually is. That's a different topic entirely. If you endeavor to keep your tires at 45psi at all times (a couple psi here or there isn't the end of the world) you'll be ahead of 95% of the populace who never pays attention and wonders why their tire wear is terrible or they get blowouts.