The idiom to cover a lot of ground means to travel over a great distance or to deal with a lot of information or facts.

1. I had to cover a lot of ground when I was explaining to Tom how to use the device because he had never come across one before.
2. I found therapy very useful and I managed to cover a lot of ground with my therapist in a sort amount of time.
3. We went on a trip for just two weeks but we still managed to cover a lot of ground and see lots of different places.

1. The teacher said that she didn't want any messing around in the class that day because there was a lot of ground that needed to be covered before the exams began.
2. The meeting was very productive. I thought that we might only be able to address a few issues, but in fact we ended up covering a lot of ground.