think of it this way, if your child drank some poison right before bedtime would you wait till the morning to go to the hospital or say forget bedtime tonight and go straight to the hospital.. your plants got poisoned so the most important thing is removing the poison, lights out can be put off for you to do this, it is better for your plants to have the light schedule off for a few hours while you flush than it would be for the plants to sit in the "poison" for 12hrs. also overwatering is frequency not quantity so don't worry about overwatering just make sure you flush the shit outta them with lots of clean "nonchlorinated" water. my brothers partner once used about 50x to strong nutes and my brother found out 24hrs later. he flushed the plants with lots of r/o water and clearex and the plants were fine, as garden knowm said just some burnt leaves. good luck