No time logged in an aircraft goes to waste.
I'll leave others to advise on your flying school, but if you are going to be away from flying for a long time - I would get a flight simulator. Something like FSX with the photo scenery. It won't help your handling skills much - you need a real aeroplane for that - but for practicing procedural stuff like navigation, diversions and instrument flying it will keep you sharp. Just make sure you have done the training in the real aircraft first so you are not teaching yourself bad habits.
Good luck! My only other bit of advice is to take a few weeks of leave in one go - if you can - and do all your subsequent training at once. There is nothing like continuity for success in flying training.
Cheers
R