钟头 (zhōng tóu): hour

Taking the high-speed train from Beijing to Shanghai takes about five hours, and you can enjoy the scenery outside the window along the way.

Mom busied herself in the kitchen for two hours and finally prepared a rich dinner.

He persisted in running for an hour every day, and after half a year he lost ten kilograms.

The meeting lasted a full three hours, and everyone was tired, but in the end they passed an important resolution.

Last night I only slept for four hours, and I kept yawning in class today.