will edit in a second wanted to get 12001
like they said,if you dont have a leak,but I still keep mine off when not in use.
I am pushing my 11th. keg right now from my 5lb. CO2 bottle. all were forced carbed but 1. so I expect to go refill the bottle any day now.
whatever you meant to say, leave it on. with the regulator, it'll hit the pressure and keep it there. no 1 ever in the history of homebrewing ever turned off the co2 when not drinking it. you should keep it carbed 24/7