Not in two months, but very quickly in the right situation.
Last year, I had a very serious medical situation that lasted the entire second half of the year. Went from 210, fairly lean at 5'10" to ~145 and very, very weak. It's been 11 months since the end of my surgeries, and I'm back up to the original weight, a bit less lean but close to as strong. So that's roughly 65lbs in a bit less than a year, and I've been at this weight for several months.