Do the math. Glance at game clock (and shot clock, if applicable), perform a mental count while scanning the court. If your mental count and game clock show more than 10 seconds from the initial game time, it is a violation. I do that whether I have to perform a visible count or not, if only to ensure that my visible count is accurate. If coach asks me, I can say that "possession started at 1:21, it's 1:10 now" if I have to explain why I called a violation.
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