Paradox Part 3

1300 hours I'm doing maths
1330 hours I'm not doing maths
1345 hours I'm doing maths
1352 hours I'm not doing maths
1356 hours I'm doing maths
1358 hours I'm not doing maths
1359 hours I'm doing maths
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So at 1400 hours, am I doing maths? Or am I lost ad infinitum?