The "have a dweller explore the wasteland for 16 hours" objective seems glitched for me. I have sent dwellers out 5 or 6 times, all of whom remained exploring and alive for 16+ hours. The objective just won't work. Sometimes it starts the countdown - "1/16, 2/16" but when I close the game and reopen, the counter is back to zero. I'm starting to feel gipped. I should have had a bunch of lunchboxes for this objective by now, and it also appears to be preventing me from getting any new objectives that award lunchboxes. What can I do?