Yes its safe. As far as time goes, usually anytime between 8 AM and 6 PM. <br /><br />Seriously, as long as its drinking water its OK.<br /><br />Good luck!
It is not safe to rev the engine beyond about 1500rpm, RBF. Not in gear or out of gear.<br /><br />Otherwise, as DHadley says, as long as the water lasts and the neighbors don't call the cops.
