If you read the notices posted on all the entrance gates of the Land Mark Mall, which mentions the opening and closing times of Mall and Carrefour, it is mentioned as
Sat to Thursday Mall Timings 0800am to 10 PM and Carrefour 0800am to 12PM
Fridays Mall Timings 0800am to 10 PM and Carrefour 1230PM to 12PM
This is what is posted on one of the Large Malls of Qatar and may be having some expat management with high qualifications and may be with from some western origin and drawing a heavy amount every month from the Mall