Review assignments and buyouts are due 3 weeks from assignment. If you can't make the due date, you should contact JR and let him know. You can not receive another assignment until all outstanding assignments are completed.

There was a time when I was about 3 weeks overdue for one of my reviews. I got a message from ... JR, I think... reminding me that the review was overdue, and asking if anything was wrong. At the time, I ended up being out of the country for two weeks, and when I got back I was really depressed. I just wasn't up for even getting out of bed for awhile there -- nevermind writing reviews! Eden was very, very understanding.

I'm not sure if there's any consequences, other than..well, you won't be able to request new review items until you get caught up. More extreme lateness might have (and should have) stricter consequences.