My son got croup last Sunday. He is now fine. My second son came down with it however and has been running a fever since Thursday. The first day it was high around 102.6, and for the past there days it's been hovering around 100.5. He is only 6 years old. It's the weekend now and my only option is the er if he needs to be seen immediately. Should I just let him ride this thing out? How long is too long to run a fever?