The challenge officially starts on Sunday mentioned on the registration page, you'll also find it in your welcome email as well as on the bottom of the challenge preparation page. The first video is released at 7 pm CEST. You'll receive a new video mission every day for 14 days (and an email notification when the video is live). The guides and any other supporting material included become available with the mission they're required for. While it's recommended to complete every mission the day you receive it, it's totally possible to catch up if you fall behind. You'll keep your access to the videos and guides even after the challenge is over. The community, however, will be cleared out 1 week after the 14th mission to make space for the next group of participants.