OK, well that took a loooooooooooooong time! i have a healthy load order (nothing like my LE load orders of old which broke the persistent records limit...) with a lot of quest mods, a fair few towns and cities mods, and a few new world mods (Beyond Reach, Wyrmstooth, etc). I set TreeLOD = 0 and TreeFullFallBack=1 but didn't change anything else. I toggled Candles and FX Glow, Windows, High, Fake Lights in Child Worlds, and the general High setting with textures at 512. It took 55 minutes before Dyndolod.exe gave me the Save/Exit options and a further 50 minutes after that before LODGen.exe finally finished with Tamriel. The resultant output is 7.21Gb :/ DynDOLOD.esm has also picked up two esps as masters - Teldryn Serious and They Took Our Jobs (the latter is part of a small merge I have but this is the only plugin in the merge with any worldspace records).
So what took so long and why is it so huge - is it the TreeFullFallBack? And what needs done to remove those two esps as masters for the esm?
Using full model trees for LOD will certainly take a much longer time to generate. If you also have high-res terrain it will take even longer.
Get DynDOLOD Standalone 2.36 beta 5 from first post I just updated. It should fix the problems with the two plugins being added as master to the esm.