The house is five minutes walk from the station.
The house is five minutes’ walk from the station.
The house is a five-minute walk from the station.
We can use a possessive time expression before a noun: ‘five minutes’ walk’, ‘two hours’ drive’, ‘a week’s holiday’.
Put the apostrophe after the -s in plural time expressions: ‘five minutes’ walk’, ‘two weeks’ notice’.
With a singular time expression, use ‘s: ‘an hour’s drive’, ‘a year’s time’.
We can also put the time expression before the noun. In this structure, use a singular time word and hyphens: ‘a five-minute walk’, ‘a two-hour drive’, ‘a one-week holiday’.
Both structures have the same meaning: ‘five minutes’ walk’ means the same as ‘a five-minute walk’.
Check our grammar lesson on possessive ‘s with time expressions.
See OLD (2)