Inconvenient refueling time which causes delays

I am a frequent traveler & I almost always fly back to Durban from Jhb on the 4pm flight & I kid you not they always choose this flight to refuel, adding a half an hour delay, then I find myself stuck in peak traffic on my way home. Please change the time to around 12 -2pm to refuel, those passengers are usually on holiday, it's tiring after a long day of work to be delayed. Please consider.