[realchucknorris]

i would say have an open and honest conversation with your co-founder where :

- talk about your feelings, aspiration, what is your long-term plan and why you are leaving (avoid discussions on whether your reasons are valid or not, make it more of a statement rather than a top to discuss)

- agree on a timeline with your cofounder, something that is workable for both of you. it could take 3-6 months where every month you lower your commitment hours to the company.

- prepare an exit plan with your co-founder (in exchange with some shares or reward),together prepare a replacement plan, delegate some of your responsibilities that can be delegated to your team members/cofounder, find a replacement for things that can't be delegated.

- find the right time, angle to raise this to the board.