If you're talking about doing this as a normal schedule, I wouldn't recommend it. If you're going to be gone and do not have a timer for your lights and you're trying to compensate with longer day/night periods... I would suggest either A, getting a cheap timer for $5 somewhere, or B, just keep your normal schedule until you're gone, then lights off, then back on when you're back the next day, and continue your normal schedule like you never left.