Hello, Elle!
Now, the time limit!
What they do is take the winning time of the stage winner and apply a formula (a kind of percentage, I think) to that time and that is the elimination time limit.
It varies from day to day.
Now, I know a bit about Cav, today.
He was away at the back of the race with two team mates, Mark Renshaw and I do not know the other one.
But the two of them left Cav, probably on team orders, to try and get inside the limit themselves, and Cav was left to look after himself.
Better that than three team mates getting eliminated.
Seems as if Cav was having a really bad day, no other reason.
He has had a lot of injuries this past year and probably is not as fit as he would like to be.