Realistic construction time for a bungalow?

correct

Scandal. The thread was part of this forum's world cultural heritage.

but still great design ;-)

Different times, different level of technical development. Log construction in the current decade is the most misunderstood "eco-bio" ever.

I would have also said that you might actually be faster with a local masonry or carpentry general contractor who is well connected locally and has a good relationship with the building authority. With a prefab house general contractor operating regionally at best, you’re just a number among many.
You’ll keep encountering the local master craftsman at Kaufland for years to come.

Even though this is a commonly held belief, the established, seasoned master craftsman doesn’t care in the slightest if a customer is rude to him at Kaufland. We are still years away from craftsmen fighting over customers because there are no more jobs. If every shoddy craftsman really went bankrupt within a few years, there would be no more botched work in construction.

I find it absurd anyway. Even the general contractors operating regionally then work locally with craftsmen. Nobody drives from Bavaria to North Frisia just to do the electrical work or install the sink.
I’ve already seen the cars of “our” installers for plumbing and electrical work parked in front of the houses of at least 4 other general contractors in this construction area…

Sure, new construction is currently declining, but the books are still full. And then there are all the customers who want to do a renovation, have the cash ready for it, but haven’t found a craftsman for years who will do it at a reasonable price.
And we also have big plans concerning the energy transition. That will also tie up capacities, and some craftsmen will think about whether they can earn better doing that than building single-family houses.

Here we are again with the good and bad businesspeople. Sure, there are those like you describe, but they will look around in bad times (and they will definitely come again) when they have a bad reputation because they laughed at the whining customer in Kaufland.
The good craftsman is concerned about his good reputation and satisfied customers even in good times because he knows that a satisfied customer brings at least one more customer.

There are national general contractors who certainly work with local ones, either all for certain trades or when capacity bottlenecks or planning problems exist. Or when the whole business model is based on that (franchise like Town & Country).

But especially the prefabricated house suppliers very often have assembly crews. They sometimes even come from abroad, work hard for three months, and then go home again for a month. A house is provided and built out in one go.

In my old neighborhood, there was always a Bien-Zenker van with Bulgarian license plates. I found that a bit amusing ("Made in Germany" but assembled by underpaid Bulgarian crew), although I don't want to say that they couldn't do it just as well as Germans (possibly even better).

Sure. However, I don't quite understand why regionality is considered a quality feature, while the traveling installation team is regarded as an unmistakable sign of disaster.

Think about it. The installation team assembles houses from the same manufacturer all year long. That's all they do.

The local craftsman installs a gas heating system, services an oil boiler, repairs a heating system, lays underfloor heating, and then occasionally installs a heat pump.

I am also a kind of "installation team." In our industry, that's a quality feature because there aren't many specialists for our systems worldwide.

You can always have luck or bad luck. And even Ede the master bricklayer can mess things up completely today, while three years ago he was building top-notch houses. With Ede, just one journeyman has to be out for longer, for example because he breaks a leg, and then he has to work faster to meet his deadlines.

Or a bungler might have pulled himself together because he is lacking orders.

I myself said that the assembly team, even if they come from Bulgaria, can initially work just as well as any other. But since the assembly team lacks the personal level - when they finish, they are gone and never see you again, you no longer have any connection to a craftsman when building a house, where you want good service for at least 5 more years. Of course, the general contractor owes you the warranty, but the service quality suffers from the lack of a personal relationship.

That may be different in the B2B sector, especially if you are quasi-monopolists for machines anyway. But that is not what we are talking about here.

Even though this is a commonly held belief, the established, seasoned master craftsman couldn’t care less if a customer acts stupidly toward him at Kaufland.

What was and is meant by

I would also say that you might even be faster with a local bricklayer or carpenter general contractor who is well connected locally and has a good relationship with the building authority. With a general contractor operating regionally at best, you’re just one number among many.
You will still meet the local master at Kaufland in the coming years.

besides the fundamental difference between "Customer Schmitz at Huberbau" and "Customer 0815 at BigName," is that the regionally reputation-conscious building contractor holds back more on unsustainable price and performance promises (the OP already hinted in post #3 at having read an advertising promise, probably something like "no one is faster – with Okal House prime ... at least six months faster").

There are regional general contractors who work together with locals, definitely all of them for certain trades or if there are capacity bottlenecks or planning problems. Or if the whole business model is based on that (franchise like Town & Country).

You seem to have somewhat misunderstood the franchise system like Town & Country.

In my old neighborhood, there was always a Bien-Zenker van with Bulgarian license plates.

Well, at least it was Bien-Zenker, not Bien or Zenker from before the merger *LOL*