It varies. Arena polo has 4 7 minute periods called Chukkas
Chukkers (or chukkas) are the name of the periods of play in Polo.
The sport of ice hockey is played in three periods.
Polo is a game that consists of six 7 minute chukkas.
A game of Polo can, depending on the level being played at, consist of four 6 minute chukkas or up to eight 7 minute chukkas.
A regular game of polo consists of four chukkas, or "periods," of seven minutes each. Ideally a rider changes to a fresh horse at the end of each chukka, which is why he or she would need four horses. An official FIP game consists of six chukkas, meaning a player might want a total of six horses or more. Some higher goal games are eight chukkas long.
Chukka (sing.), Chukkas (plural)
A chukka or chukkar, any of the six playing periods in a polo game that lasts 7 1/2 minutes
rows. the vertical columns are called periods
periods, they are periods
The time periods are called quarters and there are four of them.
A sport that requires the ability to perform for long periods of time at low intensities, such as marathon ,running and cross-country