I like to read and watch documenteries about my favorite artists. Also I enjoy some of the histories about different music genres and music in general.

You can try taking a break every now and again. instead of 1-2 hours every day try one day out of the week take a few minutes to warm up and play for fun. Don't think about having to learn anything, or get anything right. Just, play for yourself, freinds or family and have fun.

Once something turns from fun to work its now a job. Jobs generaly are not fun they are work.