The GZ250 doesn't have much of a suspension or ground clearance so if it gets very rough its going be tough. Smooth hard packed dirt is easy. Sand and gravel/rocks will be quite interesting. You don't have the right tires so its going feel a bit squirrelly. I think twenty miles is doable provided the road isn't to rough or the sand to deep.
My dirt riding experience is very limited. Mostly to well used dirt roads and a few National Forest Service Roads. A few places I go from time to time have sand deep enough that you have to go pretty fast to keep for sinking.
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