I think what the OP is inferring is the ridiculous amount of practice time per day and per week, even after 42 years doing magic (and by now, in Teller's case,

I think what the OP is inferring is the ridiculous amount of practice time per day and per week, even after 42 years doing magic (and by now, in Teller's case, it is approaching 70 years). Lots of people have been doing something, whatever, for decades, but there's no "practicing" whatsoever.