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I think that seems reasonably clear that it will be free to start but from thereon you'll be paying the usual per minute price? 30 minutes booking is helpful. I use the Lime passes when I know I'm gonna want to do lots of pootling about town on them and that's really useful - you can pop into a shop/pub etc and book your bike again the minute you end that ride, meaning it's still yours when you come out again....
Sure it must be the latter. The former would be too good value...