For Jim Collins, No Question Is Too Big - NYTimes.com:

And in a corner of the white board at the end of his long conference room, Mr. Collins keeps this short list:

Creative 53%

Teaching 28%

Other 19%

That, he explains, is a running tally of how he’s spending his time, and whether he’s sticking to a big goal he set for himself years ago: to spend 50 percent of his workdays on creative pursuits like research and writing books, 30 percent on teaching-related activities, and 20 percent on all the other things he has to do.

These aren’t ballpark guesstimates. Mr. Collins, who is 51, keeps a stopwatch with three separate timers in his pocket at all times…