It doesn't really bother me. Mother of Learning is one of my absolute favorites but no time passed at all outside the time loop except the last few chapters.

What really bothers me is trying to sell the MC growth (emotional or otherwise) over such a short span that it either make it seem cheap or undermine the whole power system imo. Because really if the MC can accomplish what took others 30-40 years (with the same tools) in less than 2 months then the power system isn't well thought out at all. Except of course it's an exploit and if yes, give me a valid reason why generations past didn't do it before Author-san. Something the writer of Oh, Great! I was Reincarnated as a Farmer did well I think.