Fastest strain?

Most autos take about the same amount of time.

Fast is not always the greatest. A lot of auto plants that flower super early start flowering when the plant is still basically a seedling. This can lead to only getting very small harvest I grew a couple of the titan f1 from rqs and they started showing signs of flowering at day 19 after sprouting from the soil they were really small still like 7in they fat decent buds bud it was not anything special to smoke I prefer smoking some exotic

It really depends because all seeds are technically their own genetics. But look for indica dominant auto strains because they are already a fast flowering strain. I had the afghan auto from fastbuds as a tester strain years ago and she finished in a total of 7 weeks from seed to finish. but like i said each seed will be its own genetic and you cant guarantee a fast strain. If you pop a bunch of them then you'll get an average of how fast they are but just popping one seed and expecting it to be a certain thing is a hard plan to keep on track. Look for indica dominant strains. or afghan type genetics normally finish quickly. another thing ive done is pick certain strains and go through peoples diaries and see how long or fast it took for them and their plants of certain strains and you can get a decent idea of what youre getting yourself into.

Titan F1 RQS for me at least.