How does Rage crash work?

So after Rage runs out you get the crash. How long does it this last? Does it vary? If Rage has a fast enough recharge to overlap, does this cause the crash to happen more often?

The Rage crash lasts for 10 seconds.
There are three parts to it:
1: The endurance loss. This is an instant effect with no duration and happens multiple times if Rage is stacked multiple times.
2: -10000% damage. This lasts for 10s and happens multiple times if Rage is stacked multiple times ie. If you have a single Rage applied, the buff lasts for 120s followed by 10s of 1 damage attacks. If you have two stacks of Rage applied, the buff lasts for 110s with 20s of 1 damage attacks. If you managed to apply Rage three times, the buff lasts for 100s with 30s of 1 damage attacks.
3: The -defense debuff. This lasts for 10s but is completely removed if you stack Rage. As long as you reactivate Rage before the Rage crash, this effect is completely suppressed.

And it's worth noting that, just as the Veteran attack damage (Sands of Mu, Nemesis Staff, etc) can not be buffed, they can not be debuffed either (since a debuff is simply a negative buff). They will do normal damage during a Rage crash.