I'd say you have about 6 weeks left. Could it finish in 11, sure... maybe, 13... but, you have a good idea.
if you start from the day you see a stigmas everywhere, you likely have 7 weeks form that point and bloom started about 2 weeks before then (hormonal shift, however it happens in the autoflower variety). You can't see it when it starts. the indicators are all lagging. not that it matters, as it is a guess for every autoflower seed.