To be exact it's between 12-18 months depending on your start date, as Easyjet only issue contracts twice a year. I'm aware of people who have not passed this interview however they can continue to fly as Flexicrew and get another crack at the whip at a later date.
The latest I'm aware of it's 4 times a year, so 12-15 months. But we're splitting hairs now.
And 4468, don't talk smack about a recruiting and training process that you know nothing about, and that famously produces an excellent standard of pilot.