Extended rental means more freedom and time to enjoy the ride. With this activated you can keep the same bike for more than 45 minutes. 

How long can I keep the bike then?
When you activate extended rental, you can rent a bike for up to 6 hours and 45 minutes in total. After the included 45 minutes, you'll get charged NOK 5 per 15 minutes. The maximum price of one trip will always be NOK 120.   

See also:
How do I activate extended rental?
How do I pay for extended rental?

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