As everybody else said already, how far do you want to go?
It’s so complicated that unfortunately there are no rules, it’s something you gain by experience knowing what companies you’re dealing with.
Most of us rarely use a single manufacturer to do a mix therefore steeping time may vary.
Just as a thought and example, straight fruits (not creamy) as a rule of thumb might go to 2 to 5 days if e.g. you use FA or CAP or INW, but if you start using Decadent or Club Der Dampfer or fancy companies, you will need longer steeping times, up to ten days, as you see, we still are talking about fruits…(Not organic).
As a personal experience, I air the mix only if at first smell and I think that a couple of hours might help, but otherwise, no go, I’ll just leave there and forget about it. (BTW already used the stirrer, so I don’t shake it, I’d forget anyway.)
Careful planning on VG percentage and its mix percentage gives me an idea of the time needed, but be able to summarize it, it’s a daunting task on an excel sheet never mind in a vid.
You might think about talking about steeping as:
VG/PG percentage Vs Flavour percentage Vs time rather then concentrate on manufacturers (only gained by experience) that would take the listener to nowhere…
Methods? Plenty of vids out there.
The only thing that suprised me is that longer steeping is not always the better, but it just fades off, but I believe these are things that you already know.