Suspenseful Hat

I am worried about finishing my red Rikke Hat. I have quite a ways to go -- it's a very slouchy hat -- but I don't have so much yarn! The yarn is fairly expensive Madelinetosh, so I'd hate to have to buy a second skein just to top off the hat. I know I could make the hat shorter, but I really like the slouchy-ness.

I kind of like the idea of buying more Madtosh -- but my stash really is large enough.

Now the question is: Can I have this done for an FO Friday?