Most of the apps for blocking calls only allow to schedule blocking of all numbers in blacklist.
I am looking for a functionality where you could specify time for answering calls / blocking calls for numbers individually or by groups
E.g. Number A would be allowed to call (will not be blocked) on Mondays from 14.00-16.00 Number B would be blocked for the whole weekends.
If you could add contacts to predefined groups which would share the blocking policy, that would be even better.
If you find it hard to imagine why would anyone need this, then imagine a service number which hundreds of people call to get service, however each customer pays for different quality of service which provides them with different times when they can call.
Price can vary, but I wouldn't expect such an app to cost more than 3-5€ on play store. (though if you find such, but more expensive, please post it anyway)