had an auto roadrunner who flowered on day 25, and an auto blueberry that flowered on day 32. hope this helps
well first auto flowers I have never had good results from, they mostly turned herme for me - anyways wherever you got them from should tell you when it starts to flower but you can just check it after about 30 days and see what it looks like, if its flowering change the lighting to 12/12
the earliest auto iv grown to start flowering was only 15 days in!!! others wer 19-21 days from seed,all big buddha autos and you will have better results/yield without 12/12
I'm growing my auto's under 12/12 due to it eing in the same room as my flowering plants. Producing very very nice buds so far. this is my first autoflower experience, and one of them already hermed on me. not sure why, but it did.