Very difficult to determine. It can depend on HOW the board is inserted more than how many TIMES it's inserted. The manufacturers data will be derived from an automated process (testing procedure) that inserts it 'properly' to get the best possible answer!
In a real world situation you can get some cack-handed idiots ramming it into place at weird angles, too fast, too hard etc which totally destroys the 'expected' life span.
If it looks or actually IS damaged then simply replace it. There's not a lot you can do for the circuit board edge connector other than temporary repairs. I would expect someone, somewhere, does 'bare boards' that you can swap the parts over on to.
The boards themselves may be cheaply made (thin copper, poor tinning, zero gold-plating) or it may be 'genuine' with the best copper, perfect plating etc so as far as getting the information you seek it is pretty much impossible.