Loosely related to the question Will the ocean eventually erode all land?:
How long will it take for the ocean to erode Rockall (an uninhabited granite islet within the exclusive economic zone of the United Kingdom)?
On the assumption that plate tectonics is paused. (If you know that plate tectonics will carry rockal below the waves before it erodes please do mention this in your answer!)
I understand that the rate and size of storms will have an effect, both of which are unpredictable, therefore I am more than happy with an order of magnitude indication.
If you have any sources to back up numbers you've used in calculations, such as the rate of erosion of the basalt, that would be great, as I would love to do some further research.