It depends on how big the biggest cog on your cassette is and how far apart the hub flanges are, as you seem to have discovered.
If the spokes are evenly tensioned and the wheel is true, I wouldn't worry. I regard replacing single spokes as a temporary repair, when one spoke breaks then a few more aren't far behind. Keep an eye on the wheel, true it again if it goes out of true, and when you start breaking more spokes think about building your own wheel.