So, how many times should you enter a Finagle (aka giveaway)? Just once is plenty.
There's no reason to do any more than that - really. I'm not the type of guy who's going to manipulate you into opening the app over and over and over again. I'm not the sort of person who makes you re-post some self-serving message in order to improve your odds. That's not how we roll around here.
When you receive a new Finagle notification, just open the app - one time is fine.