@davide_marini, please, think as final user perspective…
Do restaurants should keep Internet access always open? Or only during working time (for instance from 11:30 to 14:30, from 18:30 to 23:00)?. And disable it during days off.
Beach-related services… maybe from 06:30 to midnight should be enough. But only during opening period.
Or diners, dealers, car selling places… they always have wworking hours and off hours.
Only exception for timeframe IMO are hotels and automated stores like fuelstations.
The ISP subscriber is responsible for traffic made by it’s connection. Therefore, no traffic allowed for no-customers.