A Chaveir of mine does not study Mussar - EXCEPT during Hodesh Elul he takes a Mussar Sefer and studies that as a preparation for Yamim Noraim.
I have a proposal loosely based upon his premise
1. Take one Classic Mussar Sefer for intense study during Hodesh Elul
2. For the remainder of the year take another sefer or collection, and learn THAT just a few minutes a day, enough to keep one's Mussar Mindset going all year long, w/o straining one's schedule.