Any bus transport from Kaiping to Zhanjiang, bus schedule and time taken ?

My friends and I will be travelling from Kaiping, Jiangmen to Haikou in October but after research there do'nt seem to have public train direct to Haikou from Kaiping but only through Guangzhou! We intend therefore, to break our journey in ZJ by travelling public bus and then to take train ferry to cross over to Haikou.
Can anyone englighten us how much time is needed to travel from Kaiping to ZJ and then Haikou as we only have two days of travelling time to arrive Haikou on time.

Thank you