Zero.

I use cologne. I’ll do two spurts to my mid-chest as I get ready for my day. If it’s late in the day (any time after 5pm) and I’m about to head out for something special, like meeting up with friends or going out for dinner, I’ll do one more spurt as a refresher.

This probably depends on the scent you’re using and how strong it is or how long it lasts. The key is to not over do it. There’s a saying about how a scent should be discovered, and not announced, so I always err on the side of less often, especially because I’m so used to the scent that it’s hard for me to smell it.