 they're at the scene before you need to rotate them out? Well, normally they're there. They go anywhere from 15 to 20 minutes, depending on activity and trying to keep them rotated. We have a group there from Fort Mill Rescue Squad and all that that helps support and keep us supplied with water and all the check vitals on everybody and all the time keep them checked. Because a lot of times the guys that keep wanting to go don't realize that they're dehydrated or whichever.