My Prefix comes from a tree and gets salty.
My Infix is a length of time usually equivalent to 4 years.
My Suffix is what you are using right now.
My whole is a game, a TV show, and a noun.
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1$\begingroup$ Is the infix, $marriage$? :P $\endgroup$ – stuart stevenson Sep 13 '18 at 12:38
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I think you are
MASTERMIND.
My Prefix comes from a tree and gets salty.
MAST means the nuts of forest trees -- though usually in the context of having them eaten by animals, where they usually wouldn't be salted. Pugmonkey has a better explanation in comments: this is about the MAST of a ship, which of course gets salty because of seawater.
My Infix is a length of time usually equivalent to 4 years.
In many places a politician's or government's TERM of office is four years.
My Suffix is what you are using right now.
It's hard to solve a puzzle without making at least some use of one's MIND.
My whole is a game, a TV show, and a noun.
Pattern-guessing game; UK quiz show; and of course a noun.
answered Sep 13 '18 at 12:48
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$\begingroup$ I think the prefix is actually referring to the rot13(znfg bs n fuvc). $\endgroup$ – Pugmonkey Sep 13 '18 at 13:19
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$\begingroup$ Well done! Although the prefix refers to what @Pugmonkey mentioned, if you change your answer to this then I'll mark it as correct :) $\endgroup$ – AHKieran Sep 13 '18 at 13:24
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$\begingroup$ Ah, that makes more sense than my interpretation. Will adjust. [EDITED to add:] Done now. $\endgroup$ – Gareth McCaughan♦ Sep 13 '18 at 13:46
