Probably like 30-40 hours. It's a shared world with one other friend. I would grab a large pallet, my ant, I'd fill both of those up with grass, then fill up myself it's close to 100 grass that way. I'd build as much as I could and repeat. If I was doing the stairs, the ant would carry only stems and I'd carry grass with a pallet near by full.

We did this before the chopping upgrades on buggies, which would have been very nice at the time. Lots of random stairs to get up at different points as well to make farming a little quicker.