Hey there
It took me just over a month to finish it and I think it was pretty quick. Anyway you shouldn't account for the minimum time as they say it's possible to do it in 4 weeks but in reality it's almost impossible.
I've seen people go there, with only 4 weeks available and they got home without the PPL. You really should consider an extra week or something cos you never know how much time it'll take, weather, etc.
Good luck!