Even though my first reaction is to tell you to visit the Roids Section.
I am not going to say 40 lbs of muscle is impossible by Jan, as I don't know what kind of genetics you are dealing with.
If you are genetically gifted, maybe you can do it. ( BIG MAYBE )
1. eating a small meal every 3 hours. ( including a source of protein )
2. Consume 30 - 40 grams of Amminos ( powder form only ) / day ( expensive but worth it.)
3. Get some Gabba ( Precursor to GH )
4. Train Hard, Sleep Hard.
Good Luck