Putting this together was not exactly rocket science. Just took a bit of math and a bit of playtime.

I worked up to the Custom Night (Night 7), and set all animatronic intelligence values to O. This ensured minimal or zero interference from them during the course of the night. If something did happen to throw off results, such as Foxy making a run at a door and draining a few percentage points in power, I just restarted the night until I got a clean run through.

Right when the game started I'd establish the required power-drain as fast as possible, and begin timing things. I'd watch the hours tick by, and make notes of how much power had been consumed in that in-game hour of time.

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One Bar: On the play-through for absolute minimal power consumption (one bar, all night) I just let the game start up and simply sat there. No doors. No camera. No lights.

This still required several tries, because even with an intelligence level of 0, Foxy still invaded the room a few times. But eventually the night passed without incident.

Two Bars: For a play through with two bars worth of consumption the entire time, I just shut the left door the moment the game started. This took less than a second. I had to stick with the door for this, because if I spent the entire time looking at the camera, and left both doors open, Chica or Bonnie could still kill me.

Three Bars: For three bars, I just shut both doors right as the game started. This also took less than a second.

Four Bars: For a night where the power consumption was at four bars all night long, I immediately shut both doors and pulled up the camera. This took apprx one-second, after I got the motion down pat. That's a very, very small deviation from the norm, and doesn't really effect the results of the calculations I made.

First thing's first: How long does each hour in the game last?

That doesn't matter much when you're just starting, but when it's just ticked over to 5am or is partway through it, you're gonna want to have a rough idea (unless there's a timer next to your monitor) of how long you have to stretch things.

The answer: 85 seconds.

Not a minute and a half, not 'about two minutes'. 85 seconds is the figure.

Meaning one night of gamplay actually lasts 8.5 minutes. (excluding pauses between nights or restarts)

Second thing's second: You don't start off at 100% power, and then it ticks down to 99%. You start off at 99%, and it drops from there. So that's the starting point for these calculations.

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One Bar

12% power drained per hour

0.141% per second

12 x 6 = 72% power loss, even with no other actions taken (or interference from Foxy) all night.

17% left-over by 6am

17% seems like a comfortable margin, and if you're most of the way through 5am and Freddy doesn't appear prepped to run, you can probably feel confident in cutting your losses and just waiting things out, doors shut.

The rest of the power consumption rates are...not so forgiving.

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Two Bars (still in the green, but be careful)

20% per hour (an 8% increase over one bar)

0.235% per second

20 x 6 = 120% power loss, even with no other actions taken (or interference from Foxy) all night.

-20% left-over by 6am. You won't make it there. Your power runs out about 3/4ths through 4am.

This is also the level of drainage you find yourself in a LOT at the higher difficulty nights. If you're rushing from one button to another button to the camera to the lights (and on and on and on) you'll kill your power supply much faster than you'd expect. This is the level of power you might be using a lot, so it's also where pacing yourself comes into play the most.

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Three Bars (there's a good reason the third bar is a bright warning yellow color)

29% per hour (a 9% increase over two bars)

0.341% per second

29 x 6 = 174% power loss, even with no other actions taken (or interference from Foxy) all night.

-74% left-over by 6am. You will barely last 3.5 hours, if you're lucky about Foxy not draining you even further.

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Four Bars (the power percentage resembles more of a count-down at this level of drain)

38% per hour (another 9% increase over three bars)

0.447% per second (pretty damn close to half a percent every second)

38 x 6 = 228% power loss, even with no other actions taken (or interference from Foxy) all night.

-128% left-over by 6am. You won't even make it 3am. Power runs out in about 2.75 hours.

On the higher difficulty levels, this is somewhere you can end up all too easily, if you're not able to track where Freddy is, keep Foxy behind his curtain, and have both Bonnie and Chica standing outside your doors.

If you're a good ways through 5am, and Foxy doesn't appear to be an immediate threat, you might be better off just saying 'Bugger it', opening your doors, and taking your chances. If you've been getting harassed a lot and power is teetering on the brink, bringing up the camera or pushing the lights when you're already at three bars could end up pushing you over the edge too soon to survive the clock.

TIMING TIMING TIMING!

That's what this breaks down to. Especially in the later hours and tougher difficulty settings.

Keeping in mind or timing just how long (via the timer next to the monitor I mentioned earlier, or bringing a timer up on-screen) the night has actually been gives you much greater flexibility in determining whether to expend more energy on a course of action.

It gives you better clarity on whether to check for Foxy, or expend power on lights, if you haven't been listening for foot-steps outside your door. If you've lost track of Freddy's eyes in the darkness, but you're also bouncing back to a Foxy who's already standing outside the stage with his hook shining in the lights, you can decide whether to keep checking cameras, or just bite the bullet and shut your right door, and go back to the fox.

Worst case scenario, it saves you a bit of time and grief when Bonnie or Chica have gotten into your room. It gives you a better idea of how long you can risk bringing up the camera to watch Foxy, and hope the power lasts long enough for the night to end before your camera is yanked down and you're killed.

Worst worst case scenario, you know an animatronic is in your room, 5am has just ticked over, and you know you're not going to make it by any stretch. Bring up your camera, drop it down, get killed, try again.

Hope this helps!