The entire season including playoffs may not exceed 180 days. Constitutional amendment 13.

13. The entire season including playoffs may not exceed 180 days.
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Friday, June 8, 2012
Constitutional amendments for team sports.

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That's about half a year, which seems like more than enough time to determine a champion, don't you think?

If my suggestion in implementing Constitutional amendment 12 (no pre-season games) were implemented, then those spring training games that count would mark the start of the season.