Hello MumbaTuu,
In between 10 and 12 hours dark will trigger the flowering phase.
I am from the Netherlands and usually start flowering start of September and Harvest around end of October.
I do own a greenhouse what makes it a lot better to prevent mold in rainy and cold weather.
In my opinion an autoflower in the months June, July and August is the best option for our climate.
Happy Growing Buddy! 💚