57 here!

It takes as long as it takes for you - just keep working on it and be patient.

For example, I've been working on American Girl by Tom Petty. The outro is not complex but it is fast - it's taken me about 3 months to get to the point where I can play along with Tom and the band! I pretty much spent a few minutes on it every night and played with the metronome - trying to speed it up a little each time.

Good advice from everyone on the thread here.