Overwatering mostly refers to the frequency of watering. If there are drain holes in the bottom of the pot, "flooding" won't be an issue. - remove the runoff water.
At this size of plant, you could water to full saturation(or close to), then it will take 3-4 days before the soil dries out, and is ready to be watered again. (full saturation is important in smaller pots like this)
The dry period between watering's is very important for growing in soil, to prevent mould/rot and certain bugs.