[_Zenith_]

Originally Posted by Soundwave-

That was a facetious simplification.

That being said, all other things held constant, there is a strong correlation between time spent practicing a skill and proficiency.

You aren't wrong here, but there are cases, especially more recently, where time is not a founding factor in skill increase (see: Rapta as one of the best examples).

There is also proof of being bound to time with skill growth and immediately having a skill boost that can increase in little amounts or a big wave. The results vary with each player, obviously some being similar with others.