I don't think there is a way other than to perhaps Fast travel around a map, that might work. Otherwise there does not seem any real logic on how time moves as I have noticed that it is suddenly night. are you playing on your own if so missions get a little easier when you can Q Kill more than one enemy, I found one mission virtually impossible when I could only silently kill 2 enemies at the same time. As others have said it is pretty repetitive, not sure if it has a story, some missions like flying the plane are rubbish and I now avoid as vehicle control is some of the worst I have come across in a game. But I am still drawn back to it as it is fun going for all the collectables. And there is not much else out there. I have just looked at my Steam back catalogue and have reinstalled some older games.