According to Garner Modern English Grammar
The idiomatic possessive should be used with periods of time and statements of worth — 30 days’ notice (i.e., notice of 30 days), three days’ time, 20 dollars’ worth, and several years’ experience.
Yet, I'd like to know how to use the possessive in coordinated nominals. I've just come across
This is two Christmases and a birthday worth of presents
