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Ben is correct - as long as the math is all U32 and you take the difference of the two the rollover won't matter - to prove it to yourself, create a couple of u32's and set one to 2^32-1 and then subtract that from one set to 1. The answer is 2 - exactly what you need for an elapsed time counter that rolled over (the 1 would be the counter that had rolled over and the 2^32-1 is the start tick count). Mark1 point