Time or length of a professional football game?

Answer 1

The English FA says that a match must be of two halves each of 45 minutes with an interval of not more than 15 minutes.

Any agreement to alter the length of time must be agreed in advance - such as in the likely event of bad light, and must abide by competition rules.

Answer 2

90 minutes
In professional soccer, 90 minutes plus a half time break. Each half is 45 minutes.

In high school soccer, each half is 40 minutes in length.

Answer 3

any where between 2 and a half, and 4 hours