How long do you have after being served an eviction notice to vacate the premises?

Question Details:

I was served with an eviction notice (10 days) after the landlord claimed I was 4 months behind which I am not. She appears to be senile. I don't have receipts. There was no written or verbal agreement on when rent was due or any kind of lease. I pay month-to-month and the notice was posted on my fence while I was out of town. How much time do I really have? Important Notice