It depends largely on the hours you've consistently been on and developed a following. In general, men jerk off early in the morning, and at night or right before bed.
Most consumers of porn are male.
The US is the main consumer of porn.
There are 3 different time zones in the US.
Sorry, but that's about as specific as I feel confident that I can honestly be. Because a lot of other things depend on personal factors.
In general, there tend to be two weeks per month where sales are higher, and those are because many people get bi weekly pay checks.
However, the exact dates vary.
If I personally needed cash fast, I would join all the main sites and take advantage of my new status to make as much money as I could, as quickly as possible.
Then maybe drop the sites that didn't work for me. Or that sucked.
The main sites are Chaturbate, Stripchat, Myfreecams, Streamate (and I think that's it for live cam, feel free to add anyone if I missed any).
There are other sites like Sextpanther where you can make a lot of money fast at times, however, they don't let any model join. Or atleast back when I was on there, you had to have a social media following of a certain number to be taken by some of the sites.