You should get every bit of the sugars out within an hour.
Temperature control is huge. You've got to have a way to keep the temp steady.
Keg #1: Brown Bomber Bourbon/Oak Vanilla Porter
Keg #2: The Bollocks ESB
Keg #3 Lawnmower APA
Bottled: Mjolnir Mead, Lazy Daze Hefe.