Advancing art class: watercolor studies

Watercolor studies should be:

1. Small
2. Quick
3. Focused (one technique or one problem)
4. Done each day

I've had problems doing the studies daily.  I have managed to do at least one or two studies a week.  In addition I do an entry or two in my watercolor journal, which I take with me when I sit on the porch in the mornings or traveling.

One thing I found was for me to do a study quickly I need to work small.  Small paper, small subject, limited pigments.  Fruits seem to be the subjects of choice for now.