>There is no standard of which I am aware. I think this would vary greatly

I swear I have heard of a standard like 20%, but I could be wrong.

>900 hours. Wow. I mean, I've probably worked over 5000 hours on our system, but this is a salaried position. I'd hate to have to try to estimate a project that large.

This is salaried too. Just trying to formalize things. :-)