I don't see the point why you would be reward after the time limit has past? it's like you need a good grade for a test and your time is up. And you still continue writing the last answers.
TLDR; Once time limit has past. You obv shouldn't get rewarded. The mission was hours long. You had 24 yet didn't use that time properly. I feel sorry that you somehow already missed 2 missions, what makes me think it's not a serious game for you.