Pure Kush flowering time

Hello, I want to plan my first grow, I had pure kush feminized seeds, on site they say 45 - 55 days of flowering.
Someone who grow this strain had different flowering times or those times are accurate?
Thank you.

most kushs ive grown are like 56-60 sometime longer

For reaching the potential quality of the strain. I found out years ago, to run at least a week longer then the breeders report.

It seems that actual flowering times are always at least a week or 2 longer than stated by the breeders