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I'm not sure how they account for the foundation, but you could probably have the house roughed together in 2 weeks, that is studs up with sheathing and roof. The remainder is a real bitch though, imagine doing all that plaster mixing and throwing it up onto the walls!

Three months sounds about right - if you dig into modern house building you can see that each step isn’t that complicated, it’s just time.

Having helpers on hand is probably not counted; literally one person is significantly harder than having three.

Here’s a crew of three that threw up three walls of a garage in a day: https://youtu.be/D5U753R3N_A (tons of other delays have happened, but framing is pretty darn fast - find a development near you can drive by everyday and watch, a whole house can go from nothing but a foundation to a thing with a roof in a week).

Building the main parts house even today is pretty quick. Most the time is spent on the finish work.