How is the Aswan (Time Bonus) determined?

I seem to be getting absurd amounts of coins on my Hayato all of a sudden (+12 emperor coins) but I don't feel like I'm completing Aswan much faster than I was before I started getting this bonus. How does the time bonus actually work?

N=N+1
N starts at 1, and evry time you enter then collect it increments up one. I think.

The bonus time is 8-12, AM and PM, every day.
It's not how fast you go.

Here's a neat table. This too.

Thank you, I didn't realize it was based on those factors. I just thought it was strange that I was suddenly getting so many coins.