it is as long as aa piece of string. All probate does is say that the value of the estate is accepted by the government and all taxes owed have been paid.
It is only after probate is granted that any of the assets can be sold. There could be shares and financial assets to be sold, valuable contents to be sold, a property to be sold.
Not all assets are easy to dispose of. My uncle had a large share in a private company where the other share owners had first dibs and all sales had to be agreed by the board of directors.. that took years tos sort out.
If all the deceased owned was cash in the bank and no other assets, distribution could be in days. If like above there are complicated assets to dispose of, or beneficiaries that cannot be traced, it could take years.
Why not contact the executors or their solicitor and ask.