Traffic between Airport Residential & Cantt. (Accra)

Hello,

We are moving to Accra this summer and I need some advice regarding the traffic situation and getting my kids to school on time. If we are driving from the airport residential area (close to the Tema motorway) to Little Explorers Montessori in Cantonment, how long could this drive take? From Google I understand that the route is mostly along Liberation Road and Giffard Road, and this would be around 7:30am and in reverse around 1pm. How bad is the traffic on these roads and could it take more than 30 minutes at those times of the day?

Thank you!
junko