Experience shows, that most of the teams are highly motivated and ready to go on after the weekend. Enthusiasm might last couple of weeks. Teams stick together and are actively working on the project. The change becomes between 2 and 4 weeks after the event, when people realize that there is actually no big progress made compared to the weekend, the idea doesn't look so sexy anymore and do not produce so much adrenaline and endorphins as it used to and daily work/life becomes a priority again. You will find tons of faults and reasons why it will not work. If you haven't made big progress within 4 weeks after your first prototype, you have to take some drastic measures or stop fooling yourself, you are not up for the task.
There are teams, who come trough this. These are the teams, who can compete on global level.