My villager has mastered 2 skills and is on farming skill and is at the point were the other two were mastered but she was at farming for an hour but still is a adept in the same spot

I think it depends on what speed you're running your game on. Also I think it depends on what that villager's likes and dislikes are.

my villager doesn't dislike or like anything

You know my villagers at times seem to go pretty fast at getting the first two mastered, but they seem to slow down at the third one. It seems like they stay at adept a lot longer than the first two. And I keep my speed at 2x all the time except when I am not returning along time then I pause it.
I myself seem to think that as they get past the first two they are usually a lot older therefore they tend to slow down.