Prusa3D Core One assembled from kit ( https://www.prusa3d.com/product/prusa-core-one-kit/ ) in roughly 36 hours, including 5 hours of sleep and frequent toddler-herding
Quite fun and satisfying
I did make a few mistakes, but wholly my own, and avoidable by reading the actual instructions
Benchy test print (15 minutes) is complete, so I guess I can start planning holiday show-bag gifts for nieces and nephews
You have a valid point about 36 hours being crazy, but an hour or two is also crazy. The kits are not in 3 pieces instead of 1, they are in pieces, and the parts come in bags like Legos. My Mk3s+ took me 10 solid hours to assemble.