Marshall,

For a static load, the equivalent of 50k from my experience.

Keep in mind there aren't any "resistors" on the ports, instead they are FET's and there are two different configurations switched in, intially strong one to pull to port 1,2,3 high and a weak one to keep it there.

Also don't forget that port pins p1.0/p1.1 do not have internals and need externals.

regards,
p