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As quick as you're willing to pay for it because prefabricated stuff can be done in parallel.

I think a more important question to me is how much does the prefabricated parts already contain, as in does it make the construction complete.

Usually the walls, roof, windows and doors are fairly quick and easy to get in, the other half of the cost goes into the rest of the detail. This includes carpets, light fittings, plugs, plumbing, tiles, carpets, cupboards, curtain rails, kitchen bits, skirting boards, toilets, towel rails, etc. and all the labour involved in setting that all up.

I can see great potential gains in doing this off site in an assembly line type fashion instead of inside of a building.

Yeah, it's a bit deceptive to say "15 days to build". The modules surely took less than time than building from scratch, but still a significant amount of time.

Yeah, kind of like saying you have to count all the time spent on ruby, rails, and all the gems you're using when you do Rails Rumble.

Making construction modular and plug and play is a hugely important innovation.

True but nothing new. We've had it in the US for decades for all types of construction.