42 lb weight lose....How long??

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Hi you lot

I really want to lose 42 lbs and just want to know long it took yous to lose that amount?
I'm 200 lbs and I'm 5' 6" not very active at moment.....actually I'm not active at all.
I use the car to go everywhere but being in Scotland can you blame me.....brrrrrr.

Anyways just need to sort a target out, I was thinking i should have it off by May.....Is that too soon?