Good luck. However, if you are going to work for 3 years to save for the IR, would you not be better off relaxing and enjoying the experience and spreading your training out. Trying to rush it will stress you out, trust me on this, make your plan but have a life as well.
Worst case scenario! If something dreadful happened in a year or two's time how would you feel about having given everything and having very little to show for it?