One thing that's pretty helpful, if you're on windows, is to just open the clock app and pin out the stopwatch over your screen. Foxy seems to move on a 15-second mark, so if you only pull up the camera on her during those times, she should never move. (I've managed to consistently hold out until 4 AM before she hits my door using that method, but that's only for 4/20 mode.) It isn't perfect though, probably because the hour in-game is 86 seconds and not a multiple of 15 or something, idk, I tend to start checking earlier and in longer windows as I get later into the night just to be safe.
That's the only thing you should be using your cameras for, until 5 AM. Bonnie and Chica have good sound cues that you shouldn't need to check lights at all, and they don't linger for more than a few seconds, so oftentimes you can open them without even checking the light. If foxy leaves the stage, don't activate her early, it's subtle but you can hear her running if you're waiting for it, and I recommend you just wait on it because it saves you power if you don't have to check on her. Many people also say this, but I'll just say it too: at 5 AM you want to leave the camera on kitchen so as to stop Freddy, and then you just stop touching them altogether. Just sit, try to stretch out any remaining power you have, and be ready on foxy's running just in case. At 8 minutes 36 seconds, the night will end.