The first half hour of every ride is always free, regardless of the number of trips per day. You can borrow the bike 46 times in one day, completely free as long as each bike ride does not exceed 30 minutes.
Would you like to borrow a bike for longer than half an hour, find a station, set back the bike and after two minutes, a new bike be can be borrowed. However, if you do not do this, the second half hour costs 10 SEK, the third costs 20 SEK and then it costs 40 SEK per half hour.
The reason for the 30-minute rule is so that as many people as possible can use the bikes and that's why bike stations are located up to 300M away.
In 30 minutes you can ride about 7 km.