We spent the remaining hour exploring the ruins on our own.

He had spent hours exploring, in perfect safety, the peaks which every year took their toll of careless climbers.

I borrowed it from my friend over a weekend and spent hours exploring.

She spent a couple of hours exploring it, just for something to do.

We wish you many happy hours exploring places in history.

He spent the next three hours exploring bookshops, with no success.

Visitors to the garden should expect to spend a minimum of one hour exploring the garden.

Spirit is expected to spend only four hours exploring in the middle of each Martian day.

He spent more than three hours exploring the ocean floor before returning to the surface.

Then, he spent five hours exploring all the new instrument could do, he said.