Working for the past

Jonas father told Jonas that the night that he was with the Giver that Gabe went to the Nurturing Center, and that Gabe would not stop crying. He also said that they took a vote and he voted in as well that Gabe should be released Jonas was shocked. The next day, the day where they started the plan Jonas took Gabe with him and started the journey. I think that I would have been screaming if my father told me the thing about Gabe, I mean Jonas held it it but I think I would have lost it. How long would it take to get to the barrier?