Honestly don't know if 11 days is too long or not. Very hard to saw without knowing how well you recover etc. For me doing only 3 sessions 6 day was perfect. I have known body builders work on 8 and 9 day rotas really effectively.
If you find that it isn't working I would suggest removing some of the days off, which the order should allow for, example below. Rota timing is very much a case of try it and see, so many variables most of them down to the individual that no-one can tell you for sure. My recovery within session is slow, but between is good. Long rests during session or I die, but day or so later ready to go again.
Day 1 - Back/Cardio
Day 2 - Chest/Cardio
Day 3 - Rest
Day 4 - Legs/Cardio
Day 5 - Shoulders/Cardio
Day 6 - Rest
Day 7 - Arms/Cardio
Day 8 and 9 - Rest
Not a lot of change there. Should still be recovered for each body part, but takes 2 days less.
As I say this is very much try it and see. It takes nothing to drop a couple of rest days without changing the sessions.
If you find that it isn't working I would suggest removing some of the days off, which the order should allow for, example below. Rota timing is very much a case of try it and see, so many variables most of them down to the individual that no-one can tell you for sure. My recovery within session is slow, but between is good. Long rests during session or I die, but day or so later ready to go again.
Day 1 - Back/Cardio
Day 2 - Chest/Cardio
Day 3 - Rest
Day 4 - Legs/Cardio
Day 5 - Shoulders/Cardio
Day 6 - Rest
Day 7 - Arms/Cardio
Day 8 and 9 - Rest
Not a lot of change there. Should still be recovered for each body part, but takes 2 days less.
As I say this is very much try it and see. It takes nothing to drop a couple of rest days without changing the sessions.