duration で (in X time)

Mastering French in two or three years is extremely difficult.

I can walk to school in ten minutes.

In about a year and a half, he sent approximately 2.2 billion spam emails.

One way or another, I have to wrap this job up within a month.

If you happen to hear from him, please tell him I'll be back in an hour.

I'll be there in about 10 minutes too.

There's no way I could do this job in a single day.

It should take about 30 minutes on foot.

She fainted, but recovered in about five minutes.

The train is scheduled to leave in five minutes.

The train leaves in 10 minutes.

She finished her homework in one hour.