I think it varies depending on a lot of factors, size of pots, lights, temps etc etc. Also different breeders seem to have different times. Some breeders have 70 day from seed to harvest Autos while others are longer. My blue dream autos I just grew were done in 72 days from start to finish but others may take 100.
Same here i am using an organic tomato bloom from lowes calmag and fish shit
40 years, myself