It's worse for a character like Batman who is in far more books. A day in the DCU must be like 240 hours long.
And that's the very reason continuity needs to always be loose and not strictly adhered to. Time itself makes certain that it will always fall apart. While it is important to keep the big things straight, whether Lois and Clark are married, or whether Oracle can walk or not, comic book "reality" needs to be able to shift without comment, reboot, or revision.