Welcome to Smogon! Take a moment to read the Introduction to Smogon for a run-down on everything Smogon, and make sure you take some time to read the global rules.
Mostly the amount of attempts would be to missed Timer0 so it would probably be about the %age you got the Timer0 you searched with compared against the % you didn't.
Timer0 is something you cannot control. You have to repeat the calibration process until you can determine which Timer0 value you get most often. Then use that one in your profile for searching things.