Looking at tours offered we note:
1. Few are that long
2. those that are, often have very weird routes around the territory, almost as if its not feasible to cross the border in Masai Mara/Serengeti. They seem determined to avoid that bit.
3. Vehicles seem more suited to the long distances than the game viewing. I am becoming concerned that unless you are very careful, you will spend most of the time travelling, and not game viewing.