It took me good three evenings to wade through this 60 page debate and now one thing is left bothering me. I did not notice any mention about the possibility Neb having literal 7 years sick leave. I am not saying that it did not get mentioned, but I feel that it is worth mentioning twice in that case.
Simply showing that the Bible and history does not allow long enough period for Neb's temporary absence from his office, is sufficient and there is no need for further calculations. This table in COJ's GTR is very helpful tool for this purpose: