Varies by plan and.. by dealer. Purchased my plan shortly before the bumper to bumper expired - not sure it makes a difference.
Here's my example: platinum, 4 years or 60,000 miles, $0 deduc was hair over $1500.
Already had front control arm replaced w alignment under plan, "saving" about $500.. so i'm in for $1000 into plan with 3 years to go
Pretty sure i'll run out of time before I run out of miles.