There is no official clock measuring this, but I am fairly certain my golf practice time has eclipsed the 10,000-hour barrier. That is the magic number for greatness, they say, which leads to the uncomfortable question of why I remain so stubbornly average. Probably because not all 10,000 hours should be graded the same. If you’re not familiar with the 10,000-hour rule, it isn’t just about golf.