yeah, bathroom hotbox is the way to go if you're young and the parents are away.

because there isn't much stuff in a bathroom for smoke smell to cling to, you can toke in there and then the smell will go after a day or so with the windows open.

Also note, in rooms that are NEVER smoked in, the smell will go a lot faster, and not cling to stuff as much. This is because if you smoke in a room often, the smell builds up. Also, bongs and pipes smell MUCH less than spliffs, you can blow hits out of a window if need be, no smell.

so hotbox the bathroom m8!