What is the length of hockey at various levels?

How long are hockey games? There is no fixed answer to this. It depends upon the various factors during the game such as overtime, whistle, regulation time, etc. But, in international or professional hockey there is a two and half hour mark, it might be long. College hockey game duration is 20 minutes, but in college game overtime is 20 minutes which increases the time of college hockey. Whereas the Recreational hockey game duration does not have any fixed time it is very flexible.