Walking back to home

Every day in the evening exactly by 6.00 , Neetu picks up her husband at Chennai Station and takes him home.

One day he left his work place by an hour earlier and  arrived  at the Chennai Station by 5.00 pm instead of 6.00 pm. 

He started walking home.

He met his wife Neetu who was on her way to the station and got into the car.

They drove home 10 minutes earlier than usual.

How long did the man walk before he was picked up by his wife?

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