Welcome to Smogon! Take a moment to read the Introduction to Smogon for a run-down on everything Smogon, and make sure you take some time to read the global rules.
15 mins NOTHING!
You need at least a third of that time to get PKRS infected and then a few more to get Vitamins spread and then you have to fly to the area w/the Pokemon you're going to take on. That's at least 10-15 mins.