It'll be full dark in an hour and a half.

By now it was about an hour after full dark.

If it was nearly full dark, the time must be well after seven.

It was full dark when he saw a light ahead.

In a little over an hour it would be full dark.

It was full dark, and they needed to be on their way.

When I opened my eyes again it was full dark.

He didn't speak again until after it was full dark.

Although it was full dark, she had no trouble making her way along the street.

It was early evening and would be full dark in less than an hour.