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At least thirty students were absent.

This classroom can accommodate only thirty students.

I found a diary my father kept for thirty years.

Tom and Mary have been married for more than thirty years.

I'm already over thirty.

The class begins at 8:30.

He made me wait for about half an hour.

You are late. The meeting finished thirty minutes ago.

I think we had better wait another thirty minutes.

Hurry up! There's only 30 minutes left before the train leaves.