It all depends. It doesn't take long to get her moaning if she's been smoking, especially if you just straight attack the clit. Guys, women love the tounge, and if you give her a good one before you start fucking, she'll do anything you want

Eating pussy is the cure for cancer. That and it can dramatically reduce stress. I think there is even like an equation for it, like

Stress = Bitching - (Skill *Time)

where bitching is inversely proportional to the amount of time you spend licking the pussy properly. In theory its possible to actually get negative stress. This is where you put it on her so good she feels the need to cook you something and bring it to you while you recover in bed lol.