Is a building services pipe sensible as fiber optic preparation?

The Kabuflex is hardly ever in stock at any building materials dealer, it was the same for us, we had to order it online. If time is really that tight, maybe try searching classified ads within a 50km radius. I also still have 40m here ;-) Alternatively, call 2-3 electricians or landscape gardeners in the area, but that might be difficult on Saturday.

I actually found a building materials supplier nearby today who has 50m in stock and I can pick it up early tomorrow. Which brings me to the next question: connect outside with the multi-circuit cable (75/90) or push it completely into the house? 50m is enough anyway and you would have the pull wire exactly where it makes sense.

At the multi-division of Doyma, there was a fastening set for mounting empty conduits. The whole thing is supposed to be sealed later.