An expert, in some literature, is defined as someone who has 10,000 hours of practice. Fully 10,000 hours of any activity is a tremendous amount of time. I ski tour day in and day out each winter. Get 10,000 hours of that? Might take some years but it’s possible. On the other hand, I don’t do transceiver searches, mock rescues, and strategizing for how to evacuate injured people day in and day out. These skills get rusty.
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