I'm not crazy, I just have another conciousness in my brain

So, in Exciting Expedition News BTCV do excursions to Iceland. They're cheap because you do work and sleep in tents but that's something I quite enjoy. It's linked with a very active conservation group in iceland, so you get good support and natives to show you around glaciers on your off days. However, they only do two week projects rather than one week ones. Can I justify having two consecutive weeks off work? Am I going to regret using up potential study time on holiday? will I kill people having to spend two weeks with them? (I've never had a bad group on a BTCV holiday - but two weeks is a long time).

Decisions, Decisions, Decisions.

On a side note, I shouldn't have to write awkward break up emails when there hasn't been any sensible dating.