Is the apostrophe needed here with these expressions of time?
In one day’s time

In three months’ time

In seven years’ time

Question

Is the apostrophe needed here with these expressions of time?
In one day’s time

In three months’ time

In seven years’ time

Answer

Yes, you need the apostrophe, but the whole phrase is rather old-fashioned sounding anyway. Good luck!

Answer

like Spencer said, yes the apostrophe is needed in this case because it is not referencing the units of time  themselves (day, month, year) but literally the amount of time that these units consist of. To say 'in one day's time' is using a possessive, literally saying the time is owned by or of the day. It is more commonly said as simply 'in one day', here using the unit directly.

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