Elapsed time
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Do this in chunks. 9.30am to 2.30 pm is 5 hours (3 hrs to 12.30 pm plus 2 hrs from 12.30 pm to 2.30 pm). But 2.28 pm is 2 minutes shorter than 2.30 pm, so we need to take this off the 5 hrs leaving 4hrs 58 mins.

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