Why do you think you are burned out, cos you and your legs are a bit tired?
Tiredness and malaise on and off the bike really, decreased performance (lack of power and endurance), increased perceived effort on rides, 30 mile rides used to be easy and it would take 40+ miles to tire me out, now I wouldn't be able to even cycle 45 miles and really struggle to ride 30 miles (took me 30 minutes longer yesterday). Used to feel an energetic buzz after a ride now come back feeling pretty rubbish. Sleep is now regularly disturbed (waking multiple times in the night), low moods, anxiety, irritability, lack of concentration, anhedonia etc.
I used to feel really strong on the bike after a rest day or if necessary a week break, first ride back from the 2 week break I felt as if I hadn't even had a rest!
I read there are 3 stages of Overtraining, stage 1 which is resolved after a week off, stage 2 requiring 2-4 weeks, and then stage 3 taking anywhere between 6 weeks - 3 months, just depending on how long you've been Overtraining, I first noticed symptoms in September and stupidly keep cycling with the same intensity, so 3 to 4 months of increasing fatigue really.