I can't go two hours of hard riding without eating. Used to be able to, can't any more. Took me a while to figure it out. An hour and a half is about my limit.

Whether it would "hurt" you... what do you mean by hurt? What are your training goals for the season? What you do after a long, hard effort is super-important in your recovery. (1) Eat - 300-500 calories of mostly carbs within the first 15 minutes, plus a few grams of protein, and replace any fluids and electrolytes you didn't replace during the effort. (2) Static stretching. (3) Ice any injuries, some people "like" an ice bath regardless, 10 minutes or so. (4) Compression sleeves or stockings.

If you've got a whole lot of delayed-onset muscle soreness, then take a few days of gentle activity to circulate the lymphatic fluid and bring blood circulation to the damaged muscles, gentle enough to not cause any more breakdown until you're ready for some more hard effort (but not excessively hard, next time).