The vanilla game should be somewhere ~5MB. Most of the bloating issues with the base game have been addressed through the USKPs. Granted I am pushing a ton of mods. However, I consider myself to be a fairly responsible mod user and try my best to configure as stable of a game as possible.
Nonetheless, I noticed my current savefile size to be to be growing, as expected. It has surpassed the 10MB mark and hovers between 10.2 and 10.4MB. This accompanies a total gametime of 109hrs.
I was wondering where other members savefiles were topping out and how many mods they may or may not be running.