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The strength of the internal pull-up is documented as the low-level input leakage current. The maximum value at VIO = 5.5 V is 20 uA, so you could consider the minimum equivalent resistance as (5.5 V) / (20 uA) = 275 kOhm. Note that this is a fairly "weak" value and so you may wish to also include an external pull-up if needed (for example, if the external leakage currents on this node due to PCB/MCU pin leakage/etc. are more than a few uA).
Please let me know if this isn't clear or if you have further questions.
