Mr Mohammad took a taxi from home to his office. His taxi fare was based on the charges shown below.

First 1 kilometre or less	$4.30
Every additional 400 m or less	$0.24
Every 45 seconds of waiting or less	$0.24

The taxi stopped once at a traffic light and travelled a total distance of 7 km to reach his office. Mr Mohammad paid $9.10. What was the longest possible duration the taxi stopped at the traffic light? Ans: ___ s