Last Monday I did a trip from Edenvale to Potch & back - I left home & 06h00, arrived in Potch at 07h27 - 87 mins to do 138.9 kms.
Return trip back took 107 mins to do 138.2 kms - I left Potch at 15h30, arrived in Edenvale at 17h17 (due to the inevitable log-jam approaching the Van Buuren off-ramp) - I detoured through Bedfordview - with its gazillion speed-bumps - to escape the usual Gillooly's nightmare.
Then I had to go to Fairland in Randburg last Tuesday & Wednesday - on the Tuesday morning trip, I left home at 06h45, and got to the client at 08h00 - 75 mins to do 27.1 kms.
The return trip of 27.4 kms took the same duration - 75 mins - I left the client at 15h45 and got home at 17h00.
The Wednesday trip took 71 mins to do 26.9 kms - I left home at 06h50 and arrived at the client at 08h01.
Coming back home again took 89 mins to do 27.3 kms - I left at 15h30 and got home at 16h59 - traffic along Club Rd East, from Sandringham through Linksfield to Edenvale was crawling along at a snail's pace.
So it's actually faster to drive from Edenvale to Potch on a weekday, than is to get to Randburg, if you factor in distance travelled over duration.