Remember-- 50% of 0 is 0. Your initial founders should have a vested interest in the success of the company. If you believe someone is important enough to bring

Remember-- 50% of 0 is 0. Your initial founders should have a vested interest in the success of the company. If you believe someone is important enough to bring in at this very early stage, then no I don't think 10% is enough even if they're part time. 70/30 seems reasonable based on what you described.