Originally Posted by chally
You are supposed to leave them on constantly. The chart shows the vols of CO2 at equilibrium. That's why they don't show a time. My best guess is that you are reading the chart or your regulator wrong.
Or the beer temperature is getting lower while the CO2 is at the same pressure, resulting in over-carbonation.
IME, it takes (as mentioned by Yooper) 10-14 days (or more) to carbonate at serving pressure. I typically plan on 2-3 weeks from when the fully chilled beer is put on gas before I pull a pint.
BTW, IF it does come out over carbonated this way, you CAN correct it. Simply disconnect the gas fitting from the keg, or turn off that line on the manifold, and vent it 2-4 times a day for 2-3 days. That's a starting point, your brew might require more time to equalize.
BTW, I would recommend getting a solid way to get the temperature of the beer in the keg. Right now, I have a sensor connected to a keg, with insulation covering it, with the display outside the fridge. This gives me a solid idea of the actual brew temperature in the keg. I've also been using thermometer strips on the kegs, that read in the range good for this application. Personally, I like being able to see the temperature without having to open up the brew fridge (and effecting the reading).