We’re glad to hear that the model at least started to run with the WW3 input replacement. Did the model ever complete successfully?
It is not unheard of for InVEST to run for multiple hours, but it is often not ideal either. For Coastal Vulnerability, it mostly depends on the processing speed on your machine and on the model resolution (given in meters) that you enter. Finer resolutions (smaller values) will create more shore points but will also take longer to compute. It looks like you chose 60m. That sounds like a rather fine resolution to me, even for a small island. I recommend increasing the resolution substantially, to say 1,000m, and testing the model with that. If that runs quickly and successfully, you can iterate, gradually reducing the resolution so that you obtain finer results, albeit slower runs.
If you’re still having issues, please upload the latest log file with the new WW3 input. Also, please note that I and our whole team will be away on Holiday break (and likely unresponsive) from December 18th, 2021 through January 2nd, 2022. We still encourage you to post though as other members of the community may be able to help and learn from you.