When to practice, when to practice...

When I was 15, I didn't worry too much about when to practice. I practiced just enough to avoid a lecture at my lesson and then got on with all my other stuff. I didn't avoid practice because I didn't like to play, I think I avoided it because: (1) I don't like to practice around other people; (2) I don't like to practice scales, arpeggios, broken chords, etc. etc. (so boring!); and (3) I was a teenager... Also, Joan tended to pick some pieces that I didn't like. I was a teenager, wanting to wallow in angst-ridden music or music with FEELING. I didn't want to play happy sonatas! "But you're such a cheerful person" she would say. Sigh.
Now the problem is fitting in practice around a full-time job and other things in a busy life! Now I care if I haven't had a good practice week, not because Peter will lecture me but because I feel I will have wasted his time and mine (yes, I know he is being paid regardless of whether I practice). I started out by getting up early and practicing in the morning. This worked well until Christmas holidays. Then a combination of sleeping in over the holidays and lack of sunlight de-railed the early morning playing. Practicing right after work has its challenges because Brian is still sleeping. Practicing in the evening can be challenging because the day that I skip the morning in order to practice in the evening is the day Brian decides to stay up after work to get things done and then sleep in the evening! Then there is the problem of how long should I practice for? Too short and I can't accomplish anything but too long results in sore hands and mental fatigue. I have settled on an hour, which is sometimes divided up between morning and evening and around other tasks. For example, I may practice one piece while supper is cooking and then next after we're finished eating. I might put on some laundry and then come back to piece number three. I wonder if concert pianists have people making supper for them...