Erm...
This was most decidedly *not* an FFQ. Nope. Not at all. Couldn't have been because then it would have been in FFR not L/C, right?
In the ep ASU, the timeline as we knew it was similar to this one only they sent Superman first, then had 100 hours until the smaller piece [6mi across IIRC] was due to hit. During that 100 hours Superman was missing and ASGARD was sent to deal with the remaining chunk but missed.
No Lex' Ark in this one, though, I promise!
Carol
Edit: crossposted with James - would I do that? /ducks and runs/