You dont have to be a kit brewer to be well planned ahead for your beers on tap! That was a bit of an odd question!
As for my keg beer, I hook the gas up to the beer out so it bubbles the gas in from the bottom and set the reg at 250kps for 48 hrs. As long as its cold when i put it on the gas its carbed perfectly every time. After 48 hrs, i hook the gas up to the gas in and set it at pouring pressure to equalise untill the drinking keg blows. THen its a 2 minuite operation to have another beer on tap.
So i voted slow as i dont shake my keg......... and using 50 liter kegs makes this difficult seing as i only weigh 80 odd kgs myself
cheers