Error trying to export layers to files in Photoshop CC

I would think the Export Layers to File script duration would vary greatly depending on document content. A document can have up to 8,000 Layers.  Creating 8,000 single layer view  of your document encoding a file for each view will take time.  The document you showed you have the issue with was also strange all the Layer were out of our view in a collapse Layer group and the document had a Frame Animation Time line that has a single Frame.  Not much of and Animation in my book.  We have no idea of what kind of layers Photoshop had to deal with or how many layer and layer groups were in your document top Collapse Layer group. 

It not a simple task to save each layer as a image file. Smart Object layer need to be Isolated and  each smart filter has  to filter the layer's pixels the transformed and distorted from the pixels Photoshop rendered for the object and the filters need to be applied in the order they were added to the layer masked by the filter mask them the smart objects layer masks need to be applied and then layer style effects  generated  before the output file can be encoded and written.  Exporting Layers to files is not a trivial operation like you seem to think it is.    How long does it take you to paint up to 8,000 pictures.

If is is so bad why  not just edit the Script  and fix it up the run better for your work. Search the Web may be other Photoshop users have and have made their versions available.  

Perhaps https://github.com/hsw107/Photoshop-Export-Layers-to-Files-Fast