If you have a will, you are suppose to file it with the court within 10 days of death. Once a probate is opened there are time requirements for taking action or seeing permission to get an extension, but there is no requirement to open a probate. Often people wait for 2 years so that if no one files a claim, the claims can be invalidated.
You could start probate the next day if you like; although to get anything effective done you will need death certificates, and that takes a week to ten days. There effectively is no latest date. The probate gets more and more difficult (read "expensive") the longer you wait. I normally tell people not to do anything until after the funeral. Then get right on it.
Since we have not read the will, nor have you said what state you are in, we have no way to answer you. As an executor, you absolutely need a lawyer, and should follow his directives.
Consumers can use this platform to pose legal questions to real lawyers and receive free insights.
Participating legal professionals get the opportunity to speak directly with people who may need their services, as well as enhance their standing in the Lawyers.com community.