From the site LifeHack – note, that’s not Lifehacker – comes a series of five steps for learning something and of them all, number 1 is best. Number 1 applies in so many places:

Focus on number of repetitions, not on the amount of time we practice.

When we say that we “studied for five hours straight,” we are often deceiving ourselves. How much of that five hours was spent in focused attention? How much time did we spend on distractions, like checking our email, or Facebook or Twitter? The key is not the length of time we spend when learning something. The key is the amount of learning repetitions that we engage in. Repetition is one of the most powerful levers we have because it wires our brain. The power of repetition is well known by top performers, athletes, musicians, and the military. Time spent is not nearly as important as the number of reps.

So here is the first step: get rid of the watch. Instead, focus your attention on completing repetitions. Instead of saying, “I’ll study my notes for two hours,” say, “I’ll read my notes through, line by line, three times from start to finish.” This causes you to focus your attention on results. It also eliminates the “illusion of effectiveness” because you can’t fool yourself. Either you completed the task, or you didn’t.

5 Hacks to Speed Up Your Learning – Ryan Clements, LifeHack (undated)

Read the rest. I’m still exploring the LifeHack site; haven’t decided what I think yet.