Yeah, 2 pounds in a 4x4 tray in under 60 days from seed is a bit of a dream.
Give yourself the extra 30 days, GOOD skills in Hydro, well trained plants and you might be able to pull it off.
My last autoflower grow I pulled a little over 2 lbs per 4x4 area in flood tables, but my shit is dialed in.
You really couldn't fit any more bud in that space. Over A gram per watt and 90 days from seed to harvest.
(Actually, I think it may have been the first GPW Auto grow. First one I've seen anyways)
Grow Log In My Sig.
Peace.
Tav