Your results may vary! My suspension needed rebuilding at 45K. The ride became very stiff and harsh and no longer soaked up the bumps.So my 77,000 mile Raptor needs suspension work? I mean, mine feels fine. Not sure how a broken suspension would feel.
A lot depends on how much you offroad. Fox's recommended maintenance schedule is a rebuild after 50,000 miles if you drive primarily on the road. If you off-road, it could be as soon as 10,000 miles. A lot depends on how much you abuse, I mean off-road, your truck.