Even though a football games lasts 3 to 4 hours how many minutes is the football in actual play during a regulation game?

The actual time specified by the AFL is 80 minutes of non-stop football.
However, most quarters drift for around 25 minutes per/quarter because of all the various stoppages in play. Overall a match goes for around 100 minutes by itself; if you then add the time players have off the field or take a break in the game, which is indicated by a siren, it comes up to about 120-140 minutes all up. This is a full AFL match.