It was two days’ work to paint my room.

It was two day's work to paint my room.

It was a work of two days to paint my room.

The stars are at several hundred light-year's distance from the Sun.

The stars are at a several hundred light-years distance from the Sun.

The stars are at several hundred light-years’ distance from the Sun.

The lightshow takes place at two hour's intervals.

The lightshow takes place at two hours' intervals.

The lightshow takes place at two-hour intervals.

To apply for this position you need five year's experience.

To apply for this position you need a five-year experience.

To apply for this position you need five years’ experience.

We went for a mile's walk.

We went for a walk of one mile.

We went for a one-mile walk.

They invested a one-year savings in the decoration of their house.

They invested one year’s savings in the decoration of their house.

They invested one years' savings in the decoration of their house.

The interview consists of a seven-minute presentation followed by eight minutes’ discussion.

The interview consists of a seven minute's presentation followed by a discussion that lasts eight minutes.

The interview consists of a seven-minute presentation followed by an eight-minute discussion.

We had to wait in the airport because our plane had two hours’ delay.

We had to wait in the airport because our plane had a two-hour delay.

We had to wait in the airport because our plane had two hour's delay.

I joined a three-hour jam session in New York.

I joined three hours' jam session in New York.

I joined three hour's jam session in New York.

I keep fit by doing three 10 minute's workouts, each of which is followed by five minutes’ rest.

I keep fit by doing three 10 minute's workouts, each of which is followed by a five minutes’ rest.

I keep fit by doing three 10-minute workouts, each of which is followed by five minutes’ rest.