I'm sure it's perfectly possible!
It took me 54 weeks to lose 4stone, but I lost the first 3 in 4 months - I had grand aims, but a lot of my circumstances changed in very quick succession in April and ever since then I've been trying to get back into plan committed. I can't speak for what you can achieve, but I know setting time-based goals doesn't work for me personally. My aim now is a loss week on week, and just sticking to the plan, I have bigger targets and things I want to hit... but I think for me focussing on getting that 1lb / 2lb off each week is enough.