I am about to put in 15 minutes each on four or five projects, each of which in fact deserve several hours. 15 minutes each is what I have for them today, so I will put in the 15 minutes so as to have started. It is my distinct impression that doing the 15 minutes now, even if I never finish the hours of work I ought, ideally, to put in, will have a more positive effect on my publics and on myself than it will do to wait, or than it would do to touch only one of these projects today.
That is how to get work done, y’all. The freshmen look terribly relieved when I explain it to them because I am presenting them with a feasible solution to matters; I have myself done this since the sixth grade. Especially if it is an important project that deserves a great deal of time, or a difficult project that needs a lot of time whether you are happy about that or not, it deserves its fifteen minutes on your busiest and tiredest days, when you cannot give it more. It deserves its fifteen.
Having known this since the sixth grade I used to find myself confused when professors would rail at me about how I needed to learn to cut corners. “But it only took fifteen minutes,” I would stammer. “I know it looks like something that could have taken longer and I apologize for that if it is a problem, but really, it only took fifteen minutes.”
So no, don’t cut more corners, y’all. It’s exhausting to rush, and it’s harder to do things poorly than to do them well. Take pleasure in doing things right, even if today you only have fifteen minutes.
Axé.
coldhearted scientist وداد 
This is a brilliant strategy. Sitting there waiting for a large chunk of free time to come by can take forever. Fifteen minutes, however, can always be found.