Which level you want? Are you good at regurgitating info and memorizing answers? I would say 10 hours of cranking through questions on one of the study guides. I would first define what you want to do with ham radio. Getting the license doesn't actually show you how to do anything other than be safe and do some math I felt like.

I can tell you one thing. I've been an amateur operator for about seven years and have never regretted it. It's a ton of fun. And you learn so many things that you would have never thought of in the past. Also rabbit holes, there are tons of them.