How long to travel by road from Gabarone to the Zimbabwe border?

Well, the road is tar all the way now - depends on traffic and how fast you drive, but 8 - 10 hours if you don't hit a cow on the road or if the sand hasn't drifted across the road in the exposed places too much. It's hot this time of year too, so take plenty of cold water or other liquid to drink. Safe journey especially in Zimb, it's not so safe there these days.