I run latex tubes and tubeless, so I must pump most rides. As tubeless I am resetting the pressure for the day's duty of gravel or cyclocross. And latex loses air a lot faster.
Butyl? Butyl without a problem should be within a pound or two for a long time. Like you could set it at 85psi and be at 82psi a couple weeks later.
Some folks can judge that just squeezing it with their thumb.