re: Anybody have experience with formosan termites?

so I'm currently sitting in my gf's parent's house and they have a pretty bad infestation right now. They got the inspection and exterminator here over a month ago and he set out traps for these bastards, but they just swarmed pretty badly in the house. Personally (and I know nothing about these termites) I feel after a month they should be gone...can anyone with experience confirm that it takes a month or longer to completely exterminate an infection??? It's pretty bad, and these suckers are serious from what little I've read online...they need to get rid of them.