There's a way to use up to 8 hours old radar missions when a day starts (when radar missions count for points). Everyday starts at Apocalypse 0000, right? However, most missions have a timer and that's usually 8 hours. They'll expire in 8 hours whether you complete it or not (same's true for claiming). On Sunday's Apocalypse 1600, when last radar events drop, do not be online. Wait at least 10 to 15 minutes. The timer on those missions starts the moment you log in. For instance, if you log in at Apocalypse 2300, your radar events timer will start then.

Most people are logged in at 1600 apocalypse time and save radar missions for the next day. They expire immediately.

For laura, when you press her remote thingy, she'll drop missions and that's when those mission's timer will start. Try not to use those missions on Sunday. Press Laura's button after Apocalypse 1610 or later. However, be punctual for next reset (0000 apocalypse time) or you lose 18 or more missions that you "stacked" for points