Well...it gets a little confusing, but I'll try to be as clear as possible
There's Paint Manufacturer's warranties on product
And Paint Contractor's warranties on service
I'll start with the Contractor's as that should be the shortest
Contractor's Warranty:
Basically you may not even get one of these, but your state or county may say you have an 'implied' one-year warranty, or your contractor may have given you a one, two, three or five year warranty on the service
That means they know they did the application properly, and if it fails, it's most likely not the contractor's fault, it's some other reason
I have not found a difference in quality application between the 1,2,3, or 5 year companies
It's more a marketing tool and "keeping up with the competition" thing
The cheesy companies generally won't offer any type of warranty
The Paint Manufacturer's Warranty:
This warranty is also more of a marketing tool than anything else
And as in general, it covers manufacturers defects in the product rather than normal wear and tear, it gets a bit cloudy as to what's covered after a few years
Basically, if one gets a "bad batch" of paint, one will know really, really, quickly...like as it is being applied
The defect could also show up as it dries, or after curing
Again...really quickly (within a few weeks)
Chances of a defect showing up after a year are minimal at best
So basically, anything over say, a generous 5 years is marketing
As most coatings "fail" due to improper preparation or application (or just wear out/off) and not a defect of the product, it's a very small gamble on the paint maker's part to offer the warranty
So, no doubt you are well beyond the Painting Contractor's warranty period
And as it's lasted 9 years, most certainly they applied it properly
If you would want to contact SW, and could provide reasonable evidence that your coating didn't meet the terms of their warranty (you'll need the exact wording of the warranty provided at the time of purchase, today's warranty does not apply to product purchased 9 years ago), and some proof, or at least suggestion, that the product is in fact SW Duration (some sort of receipt or spec. in the contract...leftover cans might even do it), it's possible they might sport you a few cans of product
You'd be responsible for applying it though