What's Your Level of Commitment?

I'm new to ninjutsu, having started about five months ago.



I'm in my early 40's with the usual family and work commitments and badly out of shape. I want to give this a serious attempt but I'm starting to think that, practically, I just may not have the time to get in shape, get flexible and practice technique enough.



So, I was wondering, how much time do you commit to ninjutsu per week (particularly if you have work to do on fitness and flexibility)?