The Beatles, Donald Bradman and Bill Gates all spent ~ 10,000 hrs becoming the best at their trade. It's become the accepted number for the amount of practice required. Easy for a soccer player, just need a bit of room to practice dribbling every spare minute from the age of 10. But wind being so fickle, is it possible for a windsurfer? If not how good would we be if we could?
My estimate, at about 100 hrs a year for 3 decades is only about 3,000 hrs. But I think it was intended that you fit all the practice in just one of your most youthful decades.
en.wikipedia.org/wiki/Outliers(book)
Have averaged between 100 and 150 sessions per years for 27 years - 1 yr for injury, average session time approx 2 hrs
125 x 26 x 2 = 6500 hrs only a geuss could be more could be less????