I don't know of enough to know "standards", but I have heard percentages around 25% before. It might be a little on the high side, but everything is a negotiati

I don't know of enough to know "standards", but I have heard percentages around 25% before. It might be a little on the high side, but everything is a negotiation ... And I know what it cost my company to sell long term consultancy contracts... Don't get blinded with what he earns. If he consistently gives you work for the next decade or so, be happy :) (That happen to a acquaintance of mine)