For liberty bell there is no fees and Philadelphia hop on hop off tour is for $32 adult fees,if you tour without stopping than it takes 90 min. Or else if u r interested in visiting places than 3-4 hours...
Its free to see the liberty bell and Independence hall. Space is limited for the hall so you need a ticket.
It's free. Doesn't take hours, but there are plenty of other attractions within walking distance worth seeing. Most of them are free as well.
Visiting the Liberty Bell has no charge, it is free!
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