I passed my two year sick-iversary recently. For many PWME's, that's not very long at all. For me, nonetheless, it was disappointing. When I started researching ME/CFS about a year and a half ago, the fist thing I wanted to know was, "what are the chances of recovery?" (I posted my findings here and here). A common mantra on message boards was: You have the best chance of recovery within the first two years. Yet here I am two years later, slightly improved from my initial "acute phase," but still a long way from recovery. Hence my disappointment.
On the other hand, I've heard different versions of the 2-year mantra. Sometimes it's 3 years, sometimes 5 years. This website says that prime range for recovery is 3 to 6 years, which would mean I haven't even reached the first milestone yet. So I'm keeping hope alive. I'll save the pity party for when I pass the 6 year mark.