Everything is now portable. A seminar by a great speaker, just about any book ever published, how-to information of every variety--it's all on audio CDs and DVDs, accessible through online media, inside your Kindle or Nook or iPad. You can use YouTube for something other than watching kittens water ski. Or you can make sure you have an actual book with you at all times. There is no excuse to simply waste time while waiting in an airport, stuck in traffic, parked in a reception room.
Some people give their odd-lot time to returning calls, texts or emails, or to talking on the phone. This is a mistake for three reasons. One, you'll be doing it hurriedly and without proper preparation, and if any of it is important, it's too important to do poorly. Two, it's a bad precedent to set with those who have access to you and with whom you communicate. If you inject randomness, you lose the ability to impose organization. Three, it steals time you need to think, to read, to listen, to get and process input. Constant connectivity makes Jack a dull boy, dull meant as synonym for stupid.
Disciplined use of the time everybody else wastes can give you an edge. The now rich and famous writer of legal thrillers, Scott Turow, wrote his first novel using only his morning commutes into New York City on the train. All around him, others just killed the same time. For most people, these minutes don't matter. But they can. So when you say to yourself "it's only 10 minutes," you miss the entire point of time.