It was about 14 years ago, that my wife and daughter went halfs on a swing set for the kids.
This picture is similar to what they got, but without the roofs.
Assembly time was marketed at 17 hours, or 28 hours, I forget. But whatever it was, they LIED!
I spent a couple of hours setting footings so it would be level.
My daughter, wife and I spent a couple of hours, sorting out the pile of wood, and pieces, so that was 3-6 man hours.
And then my brother, a Union Carpenter, and I (both are good with tools), using battery powered drill drivers, did the actual assembly. We figured, that with power tools, we'd beat the clock. Wrong!!!
IIRC, it took us about 40 man hours.