Can someone please give me a ball park for how many hours of labour are required to have the fuel line replaced...my main line is leaking in a spot just under the back of my driver's side door. If anyone can give me an idea of the cost of the part and the amount of labour that would be great thanks.

 

I paid something close to $350 in labor for all lines (brake and fuel).
If your lines a rusted out - replace all of them at the same time.
It is impossible to replace one line without moving the other ... so if they are rusty, mostly likely they'll start to leak as well sooner or later.

BTW, most shops would suggest to "bend" lines - don't do that, get new lines from Nissan dealership (they will cost you almost the same).

Hope this helps.