I really honestly had no idea they honored the FPs after the stated time. I knew some of the networks were not connected up at first and all but never really remembered which was which.
Then again, it was rare that we'd use FPs to begin with. The concept of "Oh, here's what we'll be doing in six hours" just doesn't fit in with how I do parks any more. Heck, "We're still going to be here in six hours as opposed to being home icing down the back, knees and other joints" just doesn't fit in with how I do the parks any more.