A lot of it depends on your exact job, the support network you have and how much cash your business takes to get running.

If you are a programmer or other highly employable type, my advice is to form an s-corp, get an hourly contract that will pay you 1099 and then hire people to build the product you want. Your take home pay may end up being even higher than it was before, even after paying your contractors. And, you won't have a runway to worry about.

Then, focus on cash flow ASAP. If you can get enough revenue to support yourself, then quit and dedicate yourself full time to scaling.

Alternatively, if you can reduce your expenses very low and don't make enough to pay others to build your product for you, it might be better to quit and build it out yourself.

I'd say more than that. Two years maybe, unless you have parents to fall back on and basements to live in. Worrying about feeding yourself and ending up on the street and working on your start-up do not mix.

Are you a single founder?