What is the length of hockey varies across different levels?

[mukul]

Hockey is a very popular team sport that is played at different levels such as professional level, collages, and recreational Hockey. Professional Hockey like NHL the area time period is about 2 and half hours. In collages the main timing is the same but there are 20 minute time periods instead of 5 minutes like NHL. Whereas in recreational hockey, there is on fixed timing. It is very flexible.
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