What are the Financial Accounting Responsibilities of an Executor (NJ)?

My last surviving parent died in March 2010 and one sibling was identified duties as Executor. The Executor has been very slow in fulfilling the duties and to date (May 2012) the estate still is not settled (total about $35K). The executor has not provided any financial accounting to the beneficiaries to date. What responsibilities does the Executor have to do this and what is the prescribed time frame? Thanks in advance.