5 min or 5 mins? | Learn English - Preply 5 mins" would be appropriate unless you are expressing it as an adjective then use the singular form, as in a five minute break or the ten minute mark However, in scientific writing, the abbreviation for the units is always in the singular form – 5min, 5km, 5kg
punctuation - Are ins, hrs, mins and secs the technically . . . The SI unit for time is Seconds (s) Hours (h) and minutes (min) are accepted to be used within the SI even if not standardised In scientific writing you should probably stick to those abbreviations (note that it's 60 min not 60 mins) In common usage all your examples should be understandable As is, for instance, the 5'10" style for feet-inches
How to write lengths of time in a short way with numbers 1 hour 54 mins - A duration; 1 min 54 seconds - A duration; 1 out of 54 - a ratio; probably many others; So your best bet is to know your target audience For example office workers that always work 9am to 5pm will see 1:54 is 1 hour 54 mins after 12 - noon While an audio editing team of people may see it as 1 min, 54 seconds
abbreviation of units of measure: hours vs. minutes The abbreviation for ‘hours’ is hrs The one for "Minute" is 'min' It is a unit of measure, which have standard abbreviations, and they do not change in plural nor have a final period
English notation for hour, minutes and seconds It's not particularly common for expressions of time It's similar to degrees-minutes-seconds: instead of decimal degrees (38 897212°,-77 036519°) you write (38° 53′ 49 9632″, -77° 2′ 11 4678″)