You would need to start looking for a job before you hit 0 though as it might take few months to find a job and have income again.

So 60k I would say can stretch to 2 years if you can keep your budget of spending just 2k per month. Once you only have 10k in your bank account and your business is not profitable yet you need a job.

My thoughts also, I assumed I might have closer to that amount of time before hitting rock bottom

I meant $2k just for the business side, in addition to your monthly expenses.