Just be sure you can afford it all on the ground for two months. I don't know what safari prices are where you're going; the cheap ones in low season are $500ish a person per night in many parts of Botswana, for example. And hotels you can get on points in Africa are far and few between, except in South African and some surrounding countries where local hotel chain Protea is joining Marriott Rewards this year.

You don't want to book a flight for two months and only then find out that you can't afford to stay there for two months.

Btw, I'm planning on going myself in Feb/Mar 2017, but in my case only two to three weeks and a different region: about a week in Livingstone (ie, the Victoria Falls area), and then the rest probably hopscotching a few safari camps/lodges in Botswana.