Note: I originally thought of this for germany, but if you have examples from other countries those are also welcome, since im interested in the topic in general.
So lets say im using a public WiFi, no matter where - either at a train station, or a hotel, or a company im visiting. At least in Germany, there will always be a User Agreement presented to you in some way, and it will always say that certain data about the user is stored for a certain amount of time, according to law - but this time is never specified, and i do not know what law is refered to! (example from here, paragraph 6, second block (just google translate it and youll see))
So i want to know - how long is the time period? I already know about certain laws for data storage for the topic of backup (because of work), but i do not know if this is affected by the same law. Any replies to the topic are welcome, thanks in advance!