Once I went travelling and left my arch(btw) desktop computer unplugged for just over a full month.
When I came back there were 1 235 packages needing updating, between repo and AUR.
.... It worked fine tho. That install didn't really go to shit until about a month ago, when months of sloppy system management on my end finally caught up to me and left me with a lot of mysterious issues. So I cut my losses and ditched it.