What's the difference between "life time" and "lifetime"?
According to this Yahoo! Answer (which definitely isn't an authority):
lifetime: life: the period during which something is functional (as between birth and death); "the battery had a short life"; "he lived a long and happy life"
life time: which takes place in real-time as the surgeons perform an operation that must be completed within 22 minutes
I'm more interested in the "life time" meaning. Is it correct?