Hello, Donald, how are you?
Firstly, thanks for the answering! 
Yes, perfect: I want, for example, that “x” scenario runs every day, in a random quantity ( for example, today it will run 3 times, tomorrow 4, another day just 2 times) and each of the runs will happen in a random time of the day.
I will try first to use your idea with Airtable and see if I can trigger this scenario, using another scenario like you suggested. 
Soon I will inform here!
Chers!
Dan kroll