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I couldn't find explicit guidance in either the Chicago Manual of Style or the Microsoft Style Guide, but what I have observed (and would write naturally) is with commas: The maximum time perio...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/29189 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I couldn't find explicit guidance in either the Chicago Manual of Style or the Microsoft Style Guide, but what I have observed (and would write naturally) is with commas: > The maximum time period allowed is 365 days, 23 hours, 59 minutes, and 59 seconds. You might be tempted to write the time in ISO notation (23:59:59), but this is usually used to indicate a _point in time_, not a _duration_. You could also cast it as a limit instead of a duration: > The time period must be less than 366 days. I sometimes find that the solution to a messy precision problem is to attack it from the other end -- what's the first value you _can't_ use?