Meet at the Theresa Avenue gate onto the mountain, Camps Bay. About 4-5 hours.
Bring money for the cable car ticket - and a Wildcard if you want the discount.
Some notes on the old cableway in Kasteelspoort taken from the book The Table Mountain Book by Jose Burman . This cablecar was built in 1893 to haul supplies up the Table Mountain during the construction of the dams on top. The horizontal line of the cableway was 1600 m, and it rose to a vertical height of 700 m.
Then. 
And now - 118 years later. 
Burman says: "On the summit edge of Postern Buttress they set up the cable gear, though the engine was at the foot of the cableway. 
The cable car was an open skip, on which passengers crouched amidst the equipment. It must have been a hair-raising trip, for in 14 spans in climbed a vertical height of 700 metres, the last span being 450 metres in length."
