Sorry, it was not my intention to complicate it more than necessary, so I wouldn't do anything like a reset button or click the same character again to restart the search.
I just wanted to point out, that if you don't know about the 3 seconds (and nowbody knows about it, if he/she's not reading this thread) and like to change the choosen one (not only for mistake reason) I'm sure you'd click and click again a new one within less than 3 seconds and are wondering why it doesn't work anymore... And if you assume something like a waiting time, how long would you wait, 5 seconds?
So, I personally wouldn't go over 2 seconds (to take the mouse movement into account).