How long is marijuana traceable?

Water will NOT help clean your system of marijuana. See the Related Question below.

There have been no cases of people dying from marijuana use.

It takes about 60 days before the body is clear. It goes into your fat cells and hair cells and there is nothing you can do to clean/clear the cells. Just not use is the only means.

2 to 4 months depending on lighting,oxygen,water, and soil. if you mean to harvest buds.

around 44 days from start of first hairs to ripe bud