I don't have any specifics for it, all I know is that it was enough to at least reduce Foxy's appearances during the night to 2 times only (except for 4/20 when it's basically guaranteed to get Foxy 3 times- in that night, checking the camera is only to stop Foxy from coming any more than 3 times).
It's entirely random to when Foxy wants to. There's been times where I've still gotten her 3 times in one night, coming up to a 4th one by 5AM. Generally, you want a run where she appears around 2AM and one where she appears around 4AM, but it's entirely luck. The camera is still necessary but the AI can still decide to screw you over either way.
