Well, since I generally get off work only during school breaks anyway, this year was the first time we have taken my sons out for vacation. They missed 3 days. HOWEVER, I am not opposed to taking them out for 5 days for an average to struggling student, and up to 10 for a good student. I think family is the most important thing a child has. Work and learning can be done outside the classroom. I'd hesitate to do more than those numbers. Not saying I wouldn't, just that I'd have to really think about it. But if I thought I could keep the learning going at the same rate, and not cause any undue hardship on the social aspects (including with the adults in charge), then I may consider longer. I think a lot of people focus on the learning and forget about the huge social ramifications though.