My projects now take >1hr to save with four chunks having dense clouds of 400 - 800 million points. this can add 8-12 hours of processing time for "Build Dense Cloud" and "Build Mesh" steps.
If there were a "Save" job (so I could put it between dense clouds and build mesh, or at the end) and/or a "Save project after batch completion" checkbox, it would give me more control over how frequently I save the project.
I like the security of the "save after each step" option, but I also like (and trust) the stability of PhotoScan enough that I am willing to take a few risks if it can potentially save me 12 hrs.