[quote=HollywoodMole]
When the GM gives up.
[/quote]

An rp me and a few others are in when 6 months without a post partially because christmas hit and end of year school stuff etc. Basically we all got busy. Come febuary (last year) ourr gm had effectively given up and all but declared it dead. 2 or 3 months later the rest of us banded together to jumpstart the rp and within 2 weeks we had the gm back on board. That rp survived guildfall and is still going today.

So yea only when everyone gives up does an rp truely die.