3 days isn’t necessary.
A few minutes of well invested time oughta do the trick - and that’s when she’s not in the mood.
When she’s in the mood you most likely won’t have to work very hard at all.
For most of their pubescent lives, we tell daughters to wait for love. To expect to be romanced, cherished and valued. Not to get pregnant! Not to be a slut! Behave like a lady! Then men expect their wives to rev their motors at the drop of a hat and respond biologically and psychologically as they do. The more husbands have the patience to romance, cherish, show wives they are valued and loved, the easier and faster it becomes for women to relax phsycologically and respond.