My yard is a mixed bag. Buffalo grass, and clover make up a good portion of it though. There's also a few patches of eyeless bindi.
I live on an estate, so there's lots of inconviniently placed trees and hedges. It is also on about a 25 degree slope, which gradually ends up around 35 degrees by the back yard.
I used to mow the other lawns along the estate with a zero turn mower, but along with awesome manueverability, comes zero control downhill. You cannot stop, and you cannot turn. I quit that job as it took me 16 hours (my entire weekend) to do half the estate.
For my yard, I use a Husqvarna LTR38 Ride on 'lawn tractor' which has 20 gross horse power. It cost me three grand but it managed to more than halve the time to mow my yard compared to using a Victa push mower. Albeit, using almost twice the fuel. It currently has around 40 hours use.
Because of the unique topographt of my yard, and how far clippings are launched, I start by working in sections. I'll start by the road and work clockwise around the entire front yard.
After three or four runs (38" per run), I'll use a conviniently placed tree as a turning point. After going around the tree twice, I change directions and from here, do the lawn in sections. I generally goin a large square, working my way to the centre of each section. This evwnly spreads the clippings so I don't have to catch them or rake them. It also fertilizes the lawn for me.
The back yard is a little different. Its mostly rectangular with two side yards, but it has the most obstacles.
I generally start with the sides of the house, going in one direction, and switch directions halfway. I do the same for the back yard, but have to navigate a dozen trees.
I am normally finished in 45 minutes.
I should post pictures...
These are the best I could find on my phone, the front yard.https://imgur.com/a/EcRcG
E: here's one sans-car http://i.imgur.com/U45M8js.jpg