To the posters saying Spock must mate every 7 years:
In "Amok Time", IIRC, it is mentioned, Spock tells Kirk he had hoped to be spared the Pon Farr due to his hybrid human nature (?). I looked, but have not found the exact passage.
IMO, this makes the most sense and, indeed, sets Spock apart from any set timeline for Vulcan Pon Farr.
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