feature-request: Time profiles

I'd like to be able to limit the amount of time I spend working or
browsing during certain time intervals. A hypothetical example: during a
normal work morning, I could put in up to 5 hours; after making|having
lunch I could put in another 4 hours before dinner; after dinner, I
would prefer to spend time with the family, so I'd have an upper limit
of 1 hour for browsing before bed.

I'm new to this mailing list, so please do let me know if this is
already suggested.

Paul


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