More typically, a successful project starts with 5 or 10 percent of someone’s time, and as it demonstrates impact it consumes more and more time (and attracts more and more volunteers) until it becomes a formal product. The use of 20 percent time has waxed and waned over the years, humming along at about 10 percent utilization when we last measured it. In some ways, the idea of 20 percent time is more important than the reality of it.
