Rode a century (my first) on my Trek 7.3FX just this past sunday. I have Ergon GR-2 grips on it, so I was able to vary my hand position, and I use Speedplay Light Action pedals; but other than those two modifications, it's a stock 7.3. I regularly use the bike for 50-ish mile rides, and did a metric century with it a few weeks ago.

No reason a hybrid can't be used for these distances. In my case, I partly wanted to see if I even enjoy riding long distances enough to merit spending $$$ on a bike that's intended more for that use. I'll likely get a second bike for distance rides over the next couple of years (and add a rack to the 7.3 to use it as more of a commuting/running errands bike), but until then I'll keep using my 7.3.