For indoor rabbits, you want to limit it to a few minutes at a time and on a warmer day.
While they do have thick coats, indoor rabbits are not used to going outside in the cold and don't get a chance to get used to the cooler temperatures.
Keep a close eye on him to make sure he isn't getting too cold. If he is playing in the show, try to brush off as much snow as you can before taking him inside so that he doesn't get too wet from it. If he looks cold, take him back inside.