I cold crashed and kegged 5 gallons of beer last night. It is at normal refrigeration temps and i purged the keg and set it at 30 PSI and stuck it back in the fridge. This was at 7PM Last night. I need it ready for sat night. Am i right to leave it at 30 until about 7 tonight, then bleed the excess co2 and turn it down to 12 and leave it until sat?