[Aladinsane]

In one of my current campaigns I am playing a H/E R/C with a party. I have just completed the Umar Hills Quest and been given (thrust upon me actually, lol) the cabin. I assume that like some other strongholds I will be called back to do some things. I am anxious to leave to rescue an old friend. My questions are:
1. Can I leave now without screwing up the stronghold and come back later to do whatever is necessary?
2. Is there a compelling reason why I should kill time now and complete whatever I have to do to finish the stronghold before I leave?
3. How much time will it take to finish the stronghold? The only major quests I have not done are Windspear Hills, Keldorn's Quest (U.E.), and Maevar. I really didn't want to start any of those quests before I left although I suspect I could if I had to to kill time.
Any thoughts would be appreciated. I should say that I am not looking for any spoilers regarding the stronghold. This is the one and only time I will do the ranger stronghold, so I would just assume not be spoiled. Thanks