Welcome to HBT troybott.
The length of time in primary and secondary depends on the type of beer you are making. Light ales and hefs may only be in primary for 10 days with no secondary, while big stouts require much longer than that.
Without any specifics on your brew kit, I would say that your IPA should be in primary for about 2 weeks. I wouldn't worry about secondary at this point unless you are going to add more hops (called dry hopping) after primary fermentation is finished. I would leave it in primary until the 18th and start researching the bottling procedure in the meantime. Good luck, and don't worry about it too much because you've already made beer!