You can't necessarily trust what breeder sites say. The information provided on them are for genetically superior plants grown in near perfect conditions. From what I've gathered on this website you will need to add 2-3 weeks to any estimate of grow time. Asking how long you have though is truly irrelevant because your plant won't be ready til she is. At this point you can look at your plant and no you're no where near harvest. Wait until the majority of the white hairs (80%) have receded and the plant is not making new pistils. If so you're probably in your harvest window. If you want to get real technical then you'll want to get a loupe so you can examine the ripeness of your trichomes up close giving you a much better idea of when to harvest.
Even if you're growing an auto flower you just have to let the plant grow nothing you can do at this stage is going to make it finish any faster.
2 months from when it first starts flowering. Next time you should just grab reg or fem seeds. You could germinate and veg for a week or 2, then put into flower and be finished faster than a autoflower. You can even start 12/12 right from seed(though you won't yield much) and if you have an 8 week strain be done in 2 months. I never got the appeal of auto flowers. Relax and don't rush it, learn to love the time to takes growing. Get some HID's while you're at it. Good luck