How long is a piece of string?
And there is an estate involved. It is the estate of the deceased out of which payments are to be made to beneficiaries - if the estate is solvent.
You should ask the executor for an estimate of time. If you are unhappy with the time frame given you can employ a solicitor to engage with the executor, through their solicitor, to hurry the process.
If you suspect skullduggery - which you would think was rampant from some of the posts on here but which, in my experience is quite unusual - then do go to your own solicitor.
Otherwise, it is highly likely that your benefit will wend its way to you in early course. Very few executors need or want the aggravation of irritated beneficiaries hassling them.
mf