We would say around an hour. You go into the cave with a guide and they give a little talk at the start then you are free to explore at your own pace.

There are many steps and staircases around the underground cave complex, which require you to bend to the left or right to avoid outcrops or overhanging ceilings or sidewalls. Coupled with dim lighting in places which makes for tricky navigation while you’re watching your head and your feet. It’s a beautiful and awe inspiring venue but may regrettably not make a visit easy if there’s mobility restrictions.

We just showed up & paid then the guide takes you cown gives you a little info & then leaves ypi to explore at your leisure & forever how long you wish yo stay.

Around 20 degrees year round

Yes. There are stairways the entire way. Though parts of it are fairly steep.

Yes you have to do the tour. They explanation the caves geology, the area and the history of the cave. well worth the $25.

Sneakers or boots

It really depends on how elderly and how good they are on their feet.... there is a lot of stairs (few hundred) and many are steep, plus you need to go down and back up. Toddlers would need some carrying. You could just go into the first section and not go deep down which would still be interesting. There is a fun option to go on a short slippery dip, probably more fun for the children not the eldery. :)