how many clicks?

[OnealD6N]

i have a walther P22 with a bridge mount and an internal red dot sight, i was wondering if any one knew how many clicks is an inch at 50 yrds, my buddy siad it could be like 4 clicks make 1'' @ 20 yrds or 4 clicks @ 50yrds? like i said i didnt know what it would be and the sight is a walther