They can grow alot in a month, especially the last 2 weeks, that's why you don't want to harvest early. Those seed bank dates a for grows didn't have any problems, perfect conditions, .hence short grow times, we ain't that lucky, we slow one down ,especially an auto, you can add a couple of more weeks to the time. But I love those autos, and you will too.That's why if they are growing good I ain't about to f-ck with them none.