As a day or weekly member if you do a single cycle for 35 minutes and dock the bike, your citybike account will be debited with £1. Similarly a single journey of 59 minutes will only cost £1. You cannot accumulate your rentals up to 60 minutes across several rentals. Each rental will debit your citybike account at a rate of £1 per hour or part of an hour. The same charging applies for annual members but only from 30 minutes