Last year, I came into US with 8+ months of stay outside, and the CBP officer just asked me for the reason of stay and waved me in. You should have a good enough reason for your stay outside US for 6+ months. It also depends on officer to officer. There is NO clear cut answer to these questions. Some may NOT even ask you anything, and some will probe further. If it's your day, you will be waved in, without much ado.

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