What is the "world of difference"? From the perspective of the PCs, I mean.But what does “keep turning” mean?
For me, it might mean I simply decide what happened in the interim.
For you, it might mean a series of rolls on tables or some other procedure.
There appears to be a potential world of difference between those two methods such that summarizing them both as “the world keeps turning” seems ill suited.
If the PCs decide to ignore the growing threat of the Thieves Guild and head off into the wilderness for 5 months, and upon their return they find that the thieves have killed the burgermeister and installed themselves as the overt authority in the city, does it matter whether the GM decided that ws a natural progression of the state of play or whether they rolled on some tables to discover that?