Game theory is a hybrid branch of applied mathematics and economics that studies strategic situations where players choose different actions in an attempt to maximize their returns.
The focus of attention is usually not so much on what is the best way to play such a game, but simply on whether one or the other player has a winning strategy.
Game theorists may assume players always act rationally to maximize their wins (the Homo economicus model), but real humans often act either irrationally, or act rationally to maximize the wins of some larger group of people (altruism).
One way to answer the question "What is time?" is to declare that it is whatever the time variable t is denoting in the best-confirmed and most fundamental theories of current science.
That's from your own perspective though; observers who remained stationary on earth and judged your flight from their perspective will have observed you for thousands of years.
Mathematical physicists have subsequently described even more time machines, or at least universes containing backward time travel, that are consistent with Einstein's equations of general relativity.
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