After sex & you want to keep things casual, how soon do you set up next date?

[The Byronic Man]

According to this article and this, you want to see her around every 10 days (a bit less than once a week on average). So after you have sex with her first time, do you set up the next date a few days later? Or do you set up the date around 8 days later (calling her once a week might also trigger her "pairbond")?