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@lae
No idea, but what are you planning on doing with it?
You could do some maths - what's the weight of a person? What's the force on the pedals when someone is sprinting out of the saddle? Let's say a really powerful sprinter is capable of producing 200kg downward force on the pedals (for ease of mental arithmetic - although it seems to be a reasonable estimate - I have unfortunately lent my copy of Bicycling Science to someone so I can't check), with 170mm cranks gives 34kg/m at the crank. The lowest gear on most bikes is likely to be about 1:1, so if you're a powerful guy sprinting up a hill in a low gear, then I'd say your freewheel is taking roughly this amount of torque.
So we know a freewheel can take at least that much, if that's any help.
This is all pure speculation, of course.