I'd estimate that I've pumped some tubes up over 100 times with no issues. That's just a guess though; I've never actually counted.
I fill my 700x25 tires before every ride. They usually drop from 95 to 85 psi.
My commuter's 700x35 tires get filled on Sunday and Wednesday evenings for my Monday, Tuesday and Thursday commutes. They lose ABOUT 5 psi from 90 to 85.
No issue? Maybe that is the issue: if it drops from 95 to 85 each ride, may it's due to a tiny leak around the valve stem already?
And the reason I don't need to pump often may be because my tubes are perfectly sealed owing to infrequent manipulation.
