The main variable you aren’t specifying, which makes this (I think) unanswerable, is what you mean by “mountain / peak hiker”. Are you hiking your local peak with 1-2000 ft of gain on a nice trail. A CO 14er with several thousand feet of gain at elevation? Up Rainier with 8-10,000 ft of gain? A technical peak in the Sierra with less gain but more technical aspects? Going up an 8000m in the Himalaya?
The answer to your question is going to be very highly dependent on your objective(s), and that’s just the first order variable. It’s also going to depend on a lot on your goals (1 day ascent or 3 day ascent?), your history with endurance training, etc. etc.
I think your best path to an answer is to choose an objective, look at the distance and vertical gain involved, then look at the parts of the books that talk numbers or check out one of the plans available on this site, plug in the numbers and see what pops out.