How long can a severe crash or relapse last? My daughter became ill in 2002(severe--bedridden for almost two years) and then slowly crawled out and by 2006 began to work. She worked for 30 hours for about eight months and all went well; then they upped her hours and she was working 50 hours (she loved her job) and then had such a crash, she is back in the hole. She has been this way for three months now, in agony, daily, malaise, weakness, the whole catastrophe. How long does this sort of thing last. Folks on this site seem knowledgeable.