Great question — answering as the UphillTech team:
Well the regular amount of time for each half normally lasts 45 minutes: The match lasts two equal periods of 45 minutes, unless otherwise mutually agreed between the referee and the two participating teams. Any agreement to alter the periods of play (for example to reduce each half to 40 minutes because of insufficient light) must be made before the start of play and must comply with competition rules. Injury Time is added at the end of each half: Allowance is made in either period for all time lost through: substitution(s) assessment of injury to players removal of injured players from the field of play for treatment wasting time any other cause The allowance for time lost is at the...
Full answer by Danger Fourpence: https://sports.stackexchange.com/a/734 (CC BY-SA 3.0).
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