im sorry but there is no way you can harvest 4 lbs of DRIED product in the 35-45 days bill says... no strain on the planet will yeild that. an average plant with a 40-60 day flowering period indoor will yeild anywhere between 10-16 ozs in perfect conditions.
He also stated that different strains would be ready at different time periods. Some more readily available that others, and some taking longer. Go back and listen to his words carefully. He was very accurate in what he said.