Probably no more than two years. I'm not THAT interested, but it complements economics anyway, so it could be worthwhile.
My other postgrad plans would probably relate to economics or possibly international development\politics\social sciencey stuff.
I can't really take any finance in my breadth, because I'm filling it with economics. I could probably take like one subject if I have the space.
I'm not like deadset on finance atm, I'm just wondering what my options are. It seems like an interesting area, and since my chief area of interest is economics, it could complement it really well. I suppose if I ended up taking a largely economics-based career path I'd learn plenty about finance on the way, though.