what are the MLB rules for concussed players?
According to the Baseball Almanac,
Longest NL game in MLB history was:
San Fran (8) vs. New York (6) - 23 innings, 7 hrs. 23 min
Longest AL game in MLB history was:
Chicago (7) vs. Milwaukee (6) - 25 innings, 8 hrs. 6 mins.
Game Length Records by Baseball Almanac