Do you mean :
Years beekeeping x number of hives (average per year) = bee years
So mine would be 7 years (by this May) x on average 7 colonies per year (less in early years, more now) = 49 bee years
Think it’s a better measure
@Curly green finger's than the usual question “ how long have you been beekeeping for”?
However doesn’t take into account how many apiaries ( different sites give different opportunities to learn). Also doesn’t take into account factors like how inquisitive you are, how open to trial new things , how much reading and experimentation you do, how much networking and listening to experienced beekeepers. These are all opportunities to learn and make mistakes and also find what works for you & your bees = learning and in time = bee wisdom
Still it’s a good question to ask I think