<P> Half - time for spectators offers the opportunity to visit the toilet, get some food or drink, or just exercise cramped limbs, without the fear of missing any of the action . A half - time show may be put on for the spectators to keep their attention, most famously in the case of the American football Super Bowl . As many spectators at the ground may be otherwise occupied using stadium facilities it might be inferred that the scale and spectacle of half - time entertainment is more directly related to the size of the potential television audience . </P> <P> In many sports that are televised, half - time offers the opportunity to advertise, a valuable source of revenue for television companies . In addition, it allows analysis of the game so far by pundits; controversial incidents or exceptional play may be highlighted at this time . It also allows viewers to catch up with any action that they may have missed . Half - time has spawned one of the most enduring clichés to describe football: that "it's a game of two halves ." </P> <Table> <Tr> <Th> Sport </Th> <Th> Length of half - time </Th> <Th> Length of a half </Th> </Tr> <Tr> <Td> American football </Td> <Td> 12 (professional) or 20 (college) minutes </Td> <Td> Two 15 minute quarters . Each half is 30 minutes . In IFAF, two 12 - minute quarters, with each half at 24 minutes . </Td> </Tr> <Tr> <Td> Association football </Td> <Td> 15 minutes </Td> <Td> 45 minutes plus injury time </Td> </Tr> <Tr> <Td> Australian rules football </Td> <Td> 20 minutes </Td> <Td> Two periods (quarters) of 20 minutes plus stoppage time </Td> </Tr> <Tr> <Td> Bandy </Td> <Td> ≤ 20 minutes </Td> <Td> 45 minutes plus injury time, replacement time etc . </Td> </Tr> <Tr> <Td> Basketball </Td> <Td> 15 minutes </Td> <Td> Two periods (quarters) of 10 (FIBA, WNBA, WNBL, NBL) or 12 minutes each (NBA) or one period (halves) of 20 minutes (U.S. college basketball). </Td> </Tr> <Tr> <Td> Canoe Polo </Td> <Td> 1--3 minutes </Td> <Td> 7--10 minutes </Td> </Tr> <Tr> <Td> Field hockey </Td> <Td> 10 minutes </Td> <Td> 35 minutes </Td> </Tr> <Tr> <Td> Gaelic football </Td> <Td> 12 minutes </Td> <Td> 30 or 35 minutes </Td> </Tr> <Tr> <Td> Handball </Td> <Td> 10 minutes </Td> <Td> 30 minutes </Td> </Tr> <Tr> <Td> Hurling </Td> <Td> 12 minutes </Td> <Td> 30 or 35 minutes </Td> </Tr> <Tr> <Td> Lacrosse </Td> <Td> 12 minutes in NLL only </Td> <Td> Two periods (quarters) of 15 minutes each in NLL </Td> </Tr> <Tr> <Td> Netball </Td> <Td> 5 minutes </Td> <Td> Two periods (quarters) of 15 minutes each </Td> </Tr> <Tr> <Td> Rugby league </Td> <Td> 10 minutes </Td> <Td> 40 minutes </Td> </Tr> <Tr> <Td> Rugby union </Td> <Td> 10 - 15 minutes </Td> <Td> 40 minutes </Td> </Tr> <Tr> <Td> Rugby sevens (union) </Td> <Td> 1 minute (2 minutes in competition finals) </Td> <Td> 7 minutes (10 minutes in competition finals) </Td> </Tr> <Tr> <Td> Shinty </Td> <Td> 15 minutes </Td> <Td> 45 minutes </Td> </Tr> </Table> <Tr> <Th> Sport </Th> <Th> Length of half - time </Th> <Th> Length of a half </Th> </Tr>

How long is the halftime break in rugby
find me the text answering this question