This question comes along so often and each person has there own answer to it, google will tell you between 6 and 8 hours but now understand something this is not America if you are in South Africa our weather is far less harsh so yes running your pool pump between 6 and 8 hours is great but seriously is not necessary. I own a 100,000l pool in winter I run it for 1 hour a day every second or 3rd day and in summer between 2 and 3 hours everyday, I have never had a green pool and all I have ever used is a month mate floater. The biggest trick here is really to find the time to brush your swimming pool while running the pump.
