Yeah but that doesn't really work because it still treats all the hours as fundamentally equal which just isn't true. It may take someone 20000 hours to become a doctor with a particular skillset, but that doesn't mean ANY person can do that. Person X may never, regardless of investment of time, be able to obtain a mastery of that skillset. Moreover, for things like surgery you're talking about the stacking of hours for regular education, med school, specialty, residency, and then surgery. Each of these is a threshold that increasingly fewer people can cross.

It seems that reasonably the best thing to do is to award additional value based on scarcity and necessity of profession, but you might just back yourself back into capitalism I guess? At the end of the day I can dig a ditch but you can't fix your grandfather's heart so that amortization is not a very satisfying split.