Test cricket is the form of the sport of cricket with the longest match duration and is considered the game's highest standard. Rotary Test matches are played between national representative teams that have been granted Test status, as determined and conferred by the International Cricket Council (ICC). The term Test stems from the fact that the long, gruelling matches are mentally and physically testing. Two teams of 11 players each play a four-innings match, which may last up to five days (or more in the past). It is generally considered the most complete examination of a team's endurance and ability.