Probably not.
In NSW there is a common law expectation that a non-contentious estate will be wound up within a year.
Lawyers call this "The Executor's Year". It's an artefact of the common law, not of statute.
Unless you can show misconduct, or gross incompetence sufficient to amount to gross misconduct,
then mere inefficiency is almost never a ground to remove an executor.
That being said, failing to act in a timely way, without reasonable excuse (proof of which lies with the executor)
can be a ground for removal of the executor.
Mere greed and/or impatience on the part of the beneficiaries, isn't.
Have a read of
this (which, I should add, is not my firm).