The Most Innings Ever Played - 28 Innings in 1942
Measured by innings, the longest game in NPB history was a 28-inning, 4-4 tie between Taiyo and Nagoya on May 24, 1942, played under rules with no inning limit. The game lasted approximately 3 hours and 47 minutes, remarkably short by modern standards due to the faster pace of 1940s baseball; at today's tempo, 28 innings could stretch to seven or eight hours. Both starting pitchers threw all 28 innings, an endurance feat inconceivable under modern pitcher management.
The Longest Game by Time - 6 Hours and 26 Minutes
Measured by the clock, the longest game in NPB history is the 6-hour, 26-minute battle between Hanshin and Yakult at Koshien Stadium on September 11, 1992. The game went 15 innings, ended in a 3-3 tie, and finished at 0:26 a.m., well past midnight. That figure includes a 37-minute stoppage over a disputed home-run call, but even among games without interruptions, the Yokohama-Yakult game of September 8, 1996 ran 6 hours and 19 minutes. The 28-inning record game of 1942 was over in 3 hours and 47 minutes, while a 15-inning game holds the time record - a contrast that speaks eloquently to how much longer each inning of baseball has become.
How the Rules Actually Evolved - From Clocks to Inning Caps
NPB's extra-inning rules did not shrink along a straight line of inning limits. From the 1950s through the 1980s, games were bounded mainly by time, not innings: night games in the 1950s were halted at 10:15 p.m., and day games were played until sunset. In 1971 the Central League introduced a rule that no new inning could start more than 3 hours and 20 minutes after the first pitch of a night game, and the Pacific League adopted a similar clock. Inning caps arrived in earnest in 1988, when the Central League adopted a 12-inning limit and the Pacific League combined 12 innings with a 4-hour clock. After briefly announcing unlimited extra innings for 1990, the Central League reversed course just before Opening Day and adopted a 15-inning limit with no clock, replaying tied games. The 1990s Central League duly produced a string of marathon games, including battles beyond six hours. The 15-inning era belonged to the Central League alone - the Pacific League never had one, moving to a pure 12-inning limit in 1994.
The 12-Inning Standard - 2001 Onward
In 2001 the Central League cut its limit from 15 innings to 12, aligning both leagues at 12 innings; the Pacific League had already been there since 1994, so the change was on the Central League's side. Ties became more frequent, but the toll on players eased. The rule has kept moving since: after the 2011 earthquake, the 2011-2012 seasons used a 3-hour-30-minute limit to save electricity, 2020 capped games at 10 innings, 2021 abolished extra innings entirely, and the 12-inning limit returned in 2022 (as of the end of the 2025 season). Even under a 12-inning cap, games are not necessarily short. On September 4, 2013, Nippon-Ham and SoftBank needed 6 hours and 1 minute to complete 12 innings, the longest game time in Pacific League history, and the Hiroshima-Yomiuri game of August 21, 2015 stretched to 6 hours and 21 minutes including a rain delay. Extra innings also strain pitching staffs: when a starter departs after seven innings, covering five more can require four or five relievers. Extra innings remain the ultimate test of bullpen depth.
The Physical and Mental Toll
Extra innings push both body and mind to extremes. Fielders accumulate fatigue that degrades reaction time and judgment, increasing error probability. Relievers prepared for one or two innings may be asked to throw three or more, amplifying arm stress. The victory in an extra-inning game delivers heightened satisfaction but exacts a physical cost that extends into subsequent games.
Extra Innings Distill Baseball to Its Purest Form
Extra innings carry a unique tension born from competitive equilibrium. As bench options deplete and pitching choices narrow, the game strips away tactical complexity and exposes raw individual ability and mental resilience. A walk-off hit in the 12th inning carries more weight than one in the ninth because twelve innings of accumulated tension amplify the moment. Extra innings remind us that baseball is also a sport of endurance, and that the longest games often produce the most indelible memories.