Thanks for the feedback.
The project was 1.8GB (res 4k) and the I was exporting it to a 720Hd - it took 3 hours. I am using the latest version of the program.
The reason I asked is I have an i7, 32Gb Ram 1660ti Graphics card, SSD drive so from hardware it is ok, but looking at the source files they are in 4k so the time is understandable.
I won't upload the project as I will continue on the basis that I need to allocate time for the export if using 4k.
Thanks you again for the feedback.
Alan.