punctuation - Are "ins", "hrs", "mins" and "secs" the technically correct plural abbreviations for "inches", "hours", "minutes" and "seconds"?


Are "ins", "hrs", "mins" and "secs" the technically correct plural abbreviations for "inches", "hours", "minutes" and "seconds"? I'm hoping that all examples below could possibly be correct.


Examples:


Plural: He finished the race in 4hrs 34mins 9secs.


Singular: His 4hr 34min 9sec finish was unprecedented.


Plural of 'inches': Garry was 5ft 10ins tall.


Singular of 'inches': Garry was a 5ft 10in man.




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