Question: What is the law about practicing hours?
Albert’s reply: Noise laws vary by city. In London, there’s a 1996 Noise Act that specifies 11 PM to 7 AM as quiet hours. Violations are penalized with a £ 100 fine.
In Vienna, I need to stop practicing by 10 PM to comply with noise laws, and 9 PM to comply with the house rules. (In college I was used to practicing until well after midnight!)
Some cities, such as Rome, mandate an afternoon noise break!
(Note that these answers are to the best of my knowledge.)
Digital pianos have become good enough to be of use to classical pianists during off-hours—they can solve your practice problems during quiet time!