Type of bug in my house

There's this kind of fly in my house, I don't think it's very uncommon, as I've seen them before, but I don't know what they are. It looks like a dragonfly with legs sticking out the sides with more transparent wings, and it's about the size of a dragonfly too. Does anyone know what it is? And if yes, could you please give me its life span in the adult stage too?

Thanks in advance.

Is it a mosquito hawk (aka Crane Fly)?

http://en.wikipedia.org/wiki/Crane_fly