Is there any safari extension similar to "WASTE NO TIME" that allows you to attribute different amounts of time for using different sites?

Is there any safari extension similar to "waste no time" that allows you to attribute different amounts of time for using different sites?

For instance, let's say one wants to block completely Facebook full day but allow himself 30min of youtube, 2h of Netflix and full access to Financial Times out of working hours (8h to 17h).

I couldn't find such features in the extensions like waste no time.

Coud someone give me a help with that please?