That is if they don't pull the trip from your schedule right? They will usually leave your trip on your schedule right up until the 12 hours. They will then pull it off, assign a 23K trip, then give you a call at the last minute. During IROPS they have been known to miss a few of these trips by a few minutes because they wait until they have no time left for notifications. If nothing is on your schedule at the 12 hour mark and there are still trips in open time that could be assigned to you, take a screen shot of your schedule so when they call you, you can tell them you'd be happy to do the trip as a WS and get paid for both.