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The answer is quite simple... hrs.

Quite simple but quite incorrect - in three ways in three letters

1) the international convention is that units are expressed in the singular - no s at the end - that would make it hr and not hrs

2) the international convention is that two letters are not used if one is unambiguous - that would make it h and not hr

3) the unit is defined by the BIPM (guardian of the SI units recognized everywhere but the rogue regimes of North Korea and the USA) as h

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14y ago

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