Nice rig, D. What is it? Looks like a Toro. I imagine a zero turn makes mowing around those trees a bit easier, ay? But, it does look like it'd still be a tight fit with the spacing you have. Can you spin it around one of those trees in one move?
I just started mowing our fruit tree plots this year, actually finished the back side of the property today. It looks real nice when they're mowed. Last year I would bush hog, but would only do it once a month so it would look really shaggy in no time, as fast as the weeds and grass grow here. I cleared out a lot of small rocks in those plots, so I can get the rider in there, and not tear it up.
We don't have a ZT mower, our property is too hilly to use one. We have a 48" Husqvarna. When I do mow around the trees, it takes a while, because I have cages around them. My mower can almost get around a bigger cage in one pass, but most of them are smaller, so it takes several passes. Even after that, there's still grass I can't get to. That's a job for the weedeater.
Now that I mow the 'orchards', that makes about 3 acres to do, which prob takes about 3-4 hours now. But, like I said, it sure looks nice to see a closely cropped lawn and orchard.
Are all those apple trees, and if so, are they all dwarf/semi-dwarf? What are you staking them with, conduit or T-posts, or neither? I bought a bunch of T-posts last year, but haven't lashed our apple trees to them yet.