Originally Posted by
skiffrun
I don't know if I can ride a 600 solo.
I have ridden a 400 essentially solo.
Think of it this way: a 600 is essentially a 400 on the first day, then 200 on the second day.
You can do 400 solo, so the first day should be doable.
On the second day, you've only got half that distance to cover, so it should be a wrap.