How long does it take to get highlights in my hair?

My hair is sort of long (about 3" below my shoulder), isn't very thick, and is smooth (a little wavy, mostly straight). I'm going to the salon for the first time for highlights today, and I don't know how long to expect to be there! Will it take more than one hour? Also, how much should I tip? show more My hair is sort of long (about 3" below my shoulder), isn't very thick, and is smooth (a little wavy, mostly straight). I'm going to the salon for the first time for highlights today, and I don't know how long to expect to be there!

Will it take more than one hour?

Also, how much should I tip?
Update: And I have dark brown hair, if that helps.
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