The criteria for when such a delay is undue in Germany ("ohne schuldhafte Verzoegerung"), is if it would have been within your power and not incurring gross ris

The criteria for when such a delay is undue in Germany ("ohne schuldhafte Verzoegerung"), is if it would have been within your power and not incurring gross risks/costs (unless it's your fault for creating a situation where there are gross risks/costs) to have done the required action at an earlier time. It is not undue delay if you needed to sleep, or if your ISP just cut you off and you need to go into the city and get some other ISP to get you a connection, but it is your fault if you then sit around for a month, waiting for the ISP to get it ready, without the ISP getting the connection up soon enough. They would require you to go to the city and get a permit to string fiber across from the next hub to your building, if there was no other way to get it done sooner, due to e.g. there not being anyone with free time to dig up the street and fix the cable, or whatever.