Most "dry land" Hippo that I've seen in Zim are 5' or less from the lake. So it will take some luck to get one out away from the water in the daytime. My idea of dry land Hippo hunting is finding one off by itself, way away from the lake or whatever body of water they are near. When you shoot one right next to the water, they just dive in and you only get one shot. If you brain shoot him, he'll of course just drop where he stands and offer very little excitement. I've had Hippo on quota the last two trips to Zim, and have never shot one, simply because we could never find one far enough away from the water to really make it seem like an actual hunt.
The most excitement we had was when a cow Hippo chased us a few yards up a hill, before turning and running back into the lake. Unless I'm baiting a leopard, I doubt I'll ever shoot a Hippo at this point. Would much rather spend the money on a buffalo or tuskless.