If your bottle and reg are leak free there is no reason why it won't hold the preasure. I've had bottles last 6 months leak free with no problems. 2 tips though... 1 don't leave it on a marker, markers are best left with no preasure in them and any springs not under stress. 2 check your bottles date! If it's going away for a while make sure it doesn't run out of time before it needs re-testing.
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This is not a straight forward answer as there are many many factors involved. One paintball does not equate to a certain psi out of a tank. Every marker will use a little bit more or less air per shot, the size of the tank will play a roll as a larger tank will use less pressure per shot and a smaller one more, things like the weather and your paintballs seal against the barrel walls will also sway it one way or another.
On one hand I could be using 9g cartrages and getting roughly 10 shots off of each which would mean 100psi per shot
or I could be using a very large tank and a very efficient marker and be getting 2500 shots which would make it 1.8psi per shot
a standard paint ball gun uses 14 mega pixels and 62 metric units, its in the blue envelop near the top shelf in the sheriffs yard.
Air pressure both propells the paintball from the barrel and reloads the machinery in the marker.