Ts my first time using a keg and need some help. Im using a 19litre corny keg. I have filled keg with my american pale ale and refrigerated for 24 hours as i beleive its better to carb when its cold. So ive hooked up the co2 to the gas inlet and set to 40psi and rolles the keg back and forth for a few minutes and have put back in fridge with gas still on and still set to 40 psi. How long do i leave the gas on for?? About 24 hours should see the beer carbed?? Then do i turn gas off and release headspace pressure and set to desired pouring psi say about 5-10 psi. Also if i have say a few beers one night but wont be pouring any again for a week can i turn the gas off until next time?