A period in football is called a quarter and is 15 minutes long.
About 15 minutes each quarter
Each quarter in the NFL is exactly 15 minutes long.
Quarters in a high school football game are 12 minutes in length.
There are no halves in a quarter of a football game.
A quarter usually refers to 1/4 of something. For example a quarter, as in the currency, is 1/4 of a dollar. This question is a little bit vague so I'm going to attempt to cover all aspects of it. A quarter, when referring to a business quarter, is 3 months long. A quarter, when referring to a football quarter, is 15 minutes long. A quarter, when referring to the US coin, is 24.26 mm in diameter.
15min ea. quarter, 30 min ea. half, 60min in a game
5 and 15 minutes long