How often does BIW occur?
Once every month. Usually near the beginning of the month. There is a listing for the current year on the when page. BIW begins on the Monday at 8am EST and ends a week later on the following Monday at 8am EST. The last 8 hours is included in the Sunday total. A reminder message is sent to the group the week prior to the start of the next BIW. At which time you will also be given an enrolment key to enter the challenge.
