80 minutes is about nine-tenths as long as a Football game (Association) (Soccer)
In other words, it's 0.890 times the length of a Football game (Association) (Soccer), and the length of a Football game (Association) (Soccer) is 1.10 times that amount.
(a.k.a. association football, a.k.a. soccer) (per FIFA rules; playing time only) Per Fédération Internationale de Football Association (FIFA) Laws of the Game, an association football game consists of two periods of 45 minutes each, for a total of 90 minutes of playing time (except in games played by women, or by players under 16 or over 35 years of age). The longest recorded amateur football game was a 2009 match in the Filipino town of Barotac Nuevo that lasted for 35 hours and 20 minutes.