I make about 10k€/month (revenue) from an app that I sell. In the beginning I've probably had a few weeks where I worked more than that, but on average that's probably how much I work.
The important thing is to understand that work compounds. If you keep at it, you'll eventually get something useful, no matter how slow you are.
Also, I'm very careful of chasing new stuff. It's easy to think you have to work on feature X right now, and a few months later you realise that feature was useless. If you spend 60 hours a week working on feature X, those hours were completely wasted. Much better to wait a few months and think about the feature before working on it. If the feature is actually important in the long term, a few months later won't make a big difference.
The important thing is to understand that work compounds. If you keep at it, you'll eventually get something useful, no matter how slow you are.
Also, I'm very careful of chasing new stuff. It's easy to think you have to work on feature X right now, and a few months later you realise that feature was useless. If you spend 60 hours a week working on feature X, those hours were completely wasted. Much better to wait a few months and think about the feature before working on it. If the feature is actually important in the long term, a few months later won't make a big difference.