Like ABS said, let it dry back, perhaps until the pot of soil weighs about 1/3 of just-watered (and drained) weight.
Overwatering damage is indeed not caused by a single event of flooding the soil or media but by frequently saturating the soil and driving out all the oxygen. As long as there are working drain holes in the bottom of the pot, you could theoretically put 6000gal of water on your plant, provided you didn't wash away all the soil!