Depends on how long you'll be down there in S.Africa...
If you are going to ride in heavy dirt conditions you should clean them at least once every 3 days or if you feel the bike with low power or stuttering.
My previous air filter was still the stock one (twenty years on it lol) which came with the bike and it was still pretty good.
I only changed it because I fitted the raptor660 carbs on the bike...
As long as you don't use compressed air or liquids to clean the filter you'll be fine!
A couple of little taps on a smooth surface and most of the dirt should come off. That's how I used to do!
You could put a new one prior to the journey if you want to be on the safe side.
I'm not the best guy here to talk about how many you'll need as I've never done a trip like that but I'm sure the other guys will answer you when they see your post!
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