Years and years ago I could only play 1-2 hours a day, and I wasn't exactly efficient when it came to leveling. I was pretty young so that wasn't my priority, but today I'm doing pretty well on that front. If you enjoy the game and can see yourself playing in the future then stick with it and find ways to have fun with the time you have. It's not wasting time if you're doing something you enjoy.
For the past month I've only been able to play between 1-3 hours a day, you might as well still play it. Before I was 6-7 hours a day, I can see myself going back to that much aswell ;3
If you have fun while playing then by all means play it, if I was going to play it now I couldn't even play it for more than 10 minutes because I have lost total interest in the game.