A student of mine is worried he is a slow learner. Everything is so difficult to master for him.
4 measures takes 2 hours.
1 page takes 3 weeks.
5 minute piece takes 4 months to learn.
I don't think this is something we should be worried about if organ playing comes slowly for some of us.
The most important part is not to compare yourself to others but to yourself.
Are you playing today better than yesterday?
If so, you're on the right track.