YEah i mean I'm only home 1/4 of the time because of work and other obligations...
Invest in a timer, and make sure where ever your plugged into Isn't being over loaded with the accumulative voltage of what you've plugged in.
Perfectly safe, i mean you cant be around to watch them 24/7 eh? Even in flowering at 12/12, your not gonna be around all the time... Unless your a hermit.