20 mins to reach Matar - NO WAY !
It takes 30 mins to cross just the Barwa Signals.
As due to many diverstions in that area, you need to choose two ways to reach your office...one is take the Thumama road OR the Corniche Road.
Either road you take, you need another 25mins max to reach your office as during morning hours the traffic flow is high. You may avoid the traffic, if you leave early from your house.
As in your case your office starts from 7:00am, you need to leave from your house by 6am.