Brevet, or not to brevet

[Pedal Wench]

I'm seriously debating if I should or shouldn't do a 600k on September 24. I've done a few 300ks, DNF'ed a 400 with a knee problem that I think's been resolved.

But, I haven't been able to train much, if at all, for this ride. I did a 90-something mile ride a few weeks ago, and an easy 75 over the weekend. But, not much in between. I started working a part-time job (edit: in addition to a fulltime and a freelance job), hoping to still have two days/week to ride, but they had other plans, and I've been working almost every weekend too. I might be able to get in a long ride (100+) once or twice beforehand, plus weeknight rides.

I know I could muscle my way (pun intended) through a 300 or 400K, but a 600K is a whole 'nother beast.

If I skip the 600K, I'll be able to do a 24-hour of Booty ride the following weekend (couldn't get both weekends off.)

What say you, wise women of TE?