Quick note: The last extra turn generated is the first one taken. Example: You play Time Walk, then Time Warp. You take the Time Warp turn, then you take the Time Walk turn.
...usually much more relevant when playing Fork. Fork always resolves before the spell it copied, so the most recently resolved (the original spell) goes first. And also Forking Final Fortune does nothing (in a duel) without the aid of Stifle.