Yeah... Anytime you are falling and have to take a breath to keep screaming, it's too far... 
LOL! For me, it was just realizing this chert nodule isn't doing me any good in my hand, throw it (done!) Try to get a jamb hold in the hole it left (NOPE!)
Try to find even the smallest crack to hang onto with the other hand (also NOPE!).
(starting to fall backwards)
"Oh shit, I've had it!"
Kick off from the face to maintain controlled attitude of descent. If I hang up on a projection I could end up cartwheeling down. Realize all my muscles are tight.
real tight. Little voice in my head says "Loosen up, fool, John Wilkes Booth broke his leg this way".
Start to relax a little,
Impact., left knee hit. Think "Shattered patella. Great way to kick off your geology career." Continue rolling backwards. A lot. Answer T____. Stop rolling.
Left knee hurt. T___ is there, asking me if I'm OK. Answer
"I hit my knee." He asks if I can walk. I reply I don't know, help me up and we'll find out. The knee squeaked and popped and it felt like I had ice water running down my leg, The closer we got to the vehicle, the less noise it made. It didn't hurt much, just felt like it was packed in ice.
Considering that was when any knee operation meant a horseshoe cut and at least six months off, I took my chances and wrapped it in ace bandages for a couple of weeks, and it has only haunted me a few times in the last 40 or so years. The hardest part was explaining the round bruises on my butt cheeks (from landing on my heels) to my girlfriend....who did not climb.
