I wasn't doing it for myself, I was genuinely trying.
I had no doubt about that. However, such lengthy battles are quite rare, and those that do occur are completed much faster due to accelerated animations, as Dirty mentioned. Of course, there are exceptions; I read somewhere on the portal about a 12-hour battle with accelerated animations, if my memory serves me correctly. So, for exceptional battles, exceptional measures are needed (an inconvenient virtual machine).
Such a feature would also be useful for testing battles, but, in my opinion, even that is too much. In this regard, a better alternative would be a coordinate grid, which recently appeared in SoD_SP. Now, the entire battle can be recorded in text form, and you don't have to worry about forgetting anything.
Before this, such grids were suggested on forums, and now there is something that might become established due to the widespread use of the plugin.