I did my CPL/IR while also doing shift work (I do 5 on 5 off with days/nights). I took unpaid leave for my ATPL's and was booked on average 3 times a week. I managed to get CPL/IR done in about 9 months. Weather and DA-42 issues at my school got in the way otherwise maybe take off 2 months but my advice would be to allow yourself plenty of time and use up leave for the final parts of IR and APS MCC. It is doable by the sounds of your work. However expect having to do shift swaps and have to fudge your life to make it work.