Baal Habooze, that is a big mistake. If the clock on board went slower, then it only moved 4 minutes while the rest of the world moved 5.
There is a lesson to learn from this. The more you move the longer you’ll live. If you sit around you lose time faster. How fast and how long would I have to run to become a full nano-second younger.
Talking about time manipulation, how did they make the leap from time advancing slower to time travel? That is besides the obvious question that if it will ever be invented then it would have been around for centuries.
If someone goes ahead in time and then comes back to four minutes ago, will he be stuck in an endless loop. If you ask him how many times he did it, what will he answer? If he will give you the number, that is a time-type reference, which would mean that he is not really travelling in time.
If time travel were possible, I would edit some more posts. I mean, unless it would only be allowed for the set time the first round