How to manage time for studying while working? [closed]

Question

I've been programming 8 years for a company. We build business intelligence software systems. Since I thought working is learning, I've always studied in terms of what I was doing at the company while working for 60 hours per week. These days, however, I am looking for a new company for employment, I can see that thought was a dumb idea because I frequently fail in job interviews mainly due to lack of knowledge on the other areas. Of course, I am still willing to improve myself and am really trying. But while working that much of time per week, I can't find good amount of study time to catch up.

I don't think I am the only one to concern about this so I would like to ask how you guys find time to study for your career? How many hours do you assign to studying other areas? Am I missing some time management skills?