Adventure tour (all ages) takes about 1 hour, hidden passage tour (ages 7+) takes 1.5 hours
Plan for about 2 hours if you have to wait.
There are a variety of tours. It ranges from about 1 hour to few hours. You can pick the one that you like. https://innerspacecavern.com/tours Some times it is crowded so you may have to wait before you start your tour. You need to plan accordingly
Depends on how many in your group. My tour was roughly 45 minutes from start to ending because I asked lots of questions
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