How much work have they done? A few hours, or several full time months? If they've just done a few weeks and they're leaving, it's less of a co-founder, and mo

How much work have they done? A few hours, or several full time months? If they've just done a few weeks and they're leaving, it's less of a co-founder, and more of a contractor arrangement. If it's a few weeks, how about a structure like: "Zero equity. $150 per hour worked, payable on any funding/liquidity event, or within/over 5 years."