The way I have it figured, my plot bunnies will stay or go as they will--if they're really worth picking apart and writing, my brain will keep coming back to them and fleshing them out whenever I have free brainspace. Then, when the free brainspace actually corresponds to free time (viz. midnight until two in the morning, on schooldays; more often, on other days), I have enough of an idea-shell already in my head that I can get the words out fairly decently.