The raws are still being released slowly, with the latest being Volume 2 back in June 2023 with chapter 6-10. Chapter 11 was just released on NicoNico too.
The amount of contrivances this manga is willing to throw the MC's way in order to utterly humiliate her is truly amazing, page 22 in particular got me feeling kinda funny...
So, 300 hundred years ago would shorten down by 10 pretty easily, 30 years seems about right these days for Adventurer Guilds and stuff in concept; honestly 300 years doesn't sound that far off to me either, but it's about circumstances in the end.