First, please see these examples:
a three-hour journey
a ten-pound note
a four-week course
noun + 's + noun:
I've got a week's holiday starting on Monday.
Julia has got three weeks' holiday.
I live near the station and it's only ten-minutes' walk.
Are those the same way to say something? I mean, for the first example, can I write a three-hour journey as three hours' journey?
Likewise, can I write three weeks' holiday as three-week holiday? Etc. And please, I hope you'll mention about the rule of using a hyphen sign (-).