Unfortunately, that one is probably dependent on the size of the image that you are trying to process. Currently the GFUI can get hung up if the total processing time is over 3 hours, so they suggest that you split large engraves up into parts and process in steps.
If you’re going to do that, you have to do all of the steps without closing the app, because it will mess up the alignment if you close the app mid-way.
Glowforge offers a link to an image splitter imagesplitter.net that can be used, or there is a tutorial below that explains how to split it in Photoshop. That might work better for something like that where you might not want to split it into four equal sections.
Hope that helps. 