Anybody with stores will know that selling time can and does fluctuate by large amounts. As an example in my 1000m jewelry store one day I can sell 900 for optimum price. The next day it has been 1400
With this in mind and aimed again at Greed (I'm not having a go

would it not be better to load your store daily until you get a good selling time and then load your shop to the max that day ?
If you have some idea of the fluctuations when you say 48 hrs is the best
then please ignore the questions as that makes sense.