You won't get the raise you want in one meeting—here's how long it will actually take, according to an expert negotiator

Talking about money is hard, and asking your boss for more of it can be even harder. But once you have taken the time to research your market value and mull over your compensation goals, you're likely ready to start negotiating for a higher salary.

No matter how prepared you may be, though, the first conversation with your boss about your pay or benefits likely won't wrap up with a sealed deal including everything you're hoping for, says Kathryn Valentine, CEO of Worthmore Strategies, which has helped hundreds of clients successfully negotiate their compensation packages.

It's more likely that the process will require several weeks of meetings, follow-ups and documentation, she says.