I guess it depends on the severity and timing of the breakdown.
On my safari in 2021 we were on our way back to the lodge after an unsuccessful day of bushbuck(?) hunting when the break down occurred. I can't recall exactly what the problem was but it took less than an hour to remedy the problem and back on our way. My PH was more embarrassed about having a breakdown. I took in it instride as part of the adventure.
Since I have no experience in Africa's automotive repair parts supply chain. I can only guess that it is relatively equal to American automotive repair parts supply chain: It is either in stock, out of stock, on order, or needs special ordering or any multiple combination. Then is it a DIY fix or requires a repair shop and an experienced mechanic to fix the problem.
Since I try to incorporate sightseeing and souvenir shopping into my trips, I try to be flexible so I have no problem with my PH having to get his bakki repaired at a local shop. He had ordered a repair part and service to be done between clients. Unfortunately the repair part didn't arrive until after my arrival.
NOTE: WARNING: Probably Not the wisest idea or decision for any PH to let a solo client off their perverbial leash, especially without a way to get in contact. Even in a safer part of town. TIA.
In the end I had a "rather adventurous

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" DIY day. No hunting days were lost.