You can get a lot done in 15 minutes, writes Laura Vanderkam, who realized she could often skip the late-night work hours she logged if she made better use of small gaps in her workday. "Because I knew I could work later, I wasn't pushing myself to finish the tasks that needed to be done for the next day," she writes. Keep a list of small tasks to do during these periods, which can occur between phone calls, before a delayed meeting or at the end of the day, Vanderkam writes.

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