How Long After Probate Can a Will be Contested? - typically two years after the court admits the Will to probate. So it is NOT two years from the date of death. It isn to 2 years from filing of the Will. Again it is two years from it being ordered as admitted unless there was Fraud in which case you need to consult an attorney as it is 2 years from discovery of the Fraud or when you should have discovered it.
There are other exceptions such as:
There are would be heirs that were minors
Probate of the Will was incomplete
You can still sue the executor for Breach of fiduciary duty which is within for years of act and sometimes longer if discovery was of act was not discoverable.