Three levels, three different answers

The tiles at the top answer the question before you touch anything. A typical NFL game without overtime runs 3 h 04 min from the scheduled kickoff to the final play, measured across 1,424 games from the 2021–2025 seasons. College games run about 20 minutes longer, 3 h 24 min across 2,448 games from 2023–2025, and most of that gap is halftime: about 22 minutes in college against about 14 in the NFL. High school gets a different kind of number, 48 minutes of game clock, because nobody publishes how long real high school games take.

Where the time goes

The bar splits a game into its parts using the typical real minutes of each one. The second and fourth quarters are the long ones in both the NFL and college, 47 and 43 minutes in the NFL, since the end of each half is where the clock stops most often. Each part is typical on its own, so the five numbers won’t add up to the game length on the tile, and the Super Bowl is its own case: its halftime show stretches the break to about 33 minutes.

From a kickoff time to a finish time

Once a kickoff time is set, in whatever time zone it’s listed in, every game length turns into a clock time. Lengths are counted from the scheduled time rather than the first snap, so the minutes between the listed time and the opening kickoff are already inside the answer; in the NFL the first play comes about 2½ minutes after the listed time. A 4:25 PM NFL kickoff usually ends around 7:29 PM, and 9 of 10 regular-season games were over by 7:46 PM.

Reading the dots

Each dot is one real game, placed where it would end if it had kicked off at your time. Tall columns are the finish times that come up most often, diamonds are games that went to overtime, and in the NFL a ring marks a game with a stoppage of 30 minutes or more, such as a weather delay. Each dot also carries its matchup, date and length, which show up under the chart when the dot is hovered or tapped.

Checking a free-by time

A free-by time is tested against four kinds of game, quick, typical, long and overtime; the quick and long rows are the 1-in-10 fastest and slowest finishes, not the extremes. With a 4:25 PM kickoff and somewhere to be at 7:45 PM, the quick and typical games leave 28 and 16 minutes to spare, the long game misses by a single minute and overtime by eight, and 1,212 of the 1,359 games were over in time. A finish within 10 minutes of your deadline is marked as cutting it close, and that line is a choice of the page rather than something in the data.

College and high school

College games come from ESPN’s play-by-play feed for the 2023–2025 seasons; their 3 h 24 min sits close to the NCAA’s own 3 h 27 min average for the 2024 regular season, and a 3:30 PM college kickoff usually wraps up around 6:54 PM. That feed sometimes skips stretches of a game, which makes a normal game look hours long, so 229 games with gaps like that are left out instead of being shown as delays. For high school the page keeps to what the rules set: four 12-minute quarters and a halftime of 15 or 20 minutes depending on the state, with no finish time, because there’s no public timing data to base one on.

Sources: NFL play-by-play and schedules from nflverse; college play-by-play and schedules from sportsdataverse (ESPN data); the NCAA’s 3 h 27 min average for 2024 as reported by CBS Sports; high school quarter and halftime lengths from Wikipedia’s list of gridiron football rules.

More football: 40-Yard Dash Times · NFL Playoff Odds by Record.