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Since no one else answered, I toss out the following. It's not GR so
it's probably wrong (I'm no expert), but at least it's digestible by
first-year students:
escape velocity c = sqrt(2GM/R) where M and R are mass and radius of black hole
g = GM/R^2
Solve first equation for R, plug into second.
Minimum mass of black hole is 3 solar masses. Maximum mass of known
stars is something like 30 solar masses.
Hence, we find that g can range from about 0.5 to 5 in units of
Tm/s^2. This is the value of g at the event horizon *after* the black
hole has formed.