7 to 7.5 years to totally go away. They are less bad as they age.
But everything depends on what else is on the report - if one baddie drops off and 286 remain, it won't make much difference.
When my ONLY collection fell of after 6.75 years it was worth over 50 points
The slide from grace is really more like gliding
And I've found the trick is not to stop the sliding
But to find a graceful way of staying slid