zalenium kill after a hour

gistfile1.txt

#!/bin/bash
while :
do
    echo "checking for idle container"
    docker ps --format '{{.ID}}\t{{.Image}}\t{{.Status}}\t{{.RunningFor}}' -f name='zalenium_' | grep -i hour | cut -f 1 | xargs docker stop
    sleep 600 #10 min
done