tire pressure

I don’t raise my tire pressure above the recommended pressure of 45
psi for any of my unicycles. When I hop, however, I tend to compress the
tire almost completely (and I’m still working on hopping more than ~6".
I have seen some other people put their pressure up to as much as twice
the recommended pressure, albeit with stock Miyatas, not other
Torkers/cheap unis.

How high (in general) can I push the pressure and expect my tube to live
longer than it takes me to go inside to warmer air and watch the tube pop?
I realize it’s not the tube that has the limit, but the tire, but seeing
other tires at twice the pressure makes me wonder…