Toner doesn't get Lightfast ratings, they are for dyes and pigments and inks.
How long a toner based print will hold up under direct sunlight depends entirely on the location and how much sunlight it is exposed to. A print in the sun of New York will last much longer than one in Florida.
In reality, the amount of Magenta (Red) used is the real deciding factor due to its place on the visible spectrum. It fades at a rate measured in months (In Florida sun) as opposed to years.
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