Bump. Technically, it's impossible to "drown" or overwater cannabis. You can SUFFOCATE them, but that has nothing to do with how much water is running through the medium, and everything to do with how much O2 is in the water. Otherwise, hydroponics would be impossible, as it would "drown" the plants
So long as your soil is properly aerated with perlite or the like, it is very difficult to suffocate the roots. You absolutely can suffocate a plant in compact soil with just a single, massive watering. Regardless of watering frequency. If the soil is too dense, it holds the water on the roots too long, is sucked dry of O2, & the roots begin to shut down. Frequency of watering can definitely speed up their suffocation in soil... but it's the depletion of O2 in the air/water around the roots that causes the symptoms/death of a plant that is overwatered.