[quote name='EpicFail' timestamp='1338477286' post='20853816']
why did bethesda decide to have respawn and clean up take like 15-690 game days unliek in oblivion where was like every 75 hours
[/quote]
I have a theory about that. The main quest has us fight through a huge Forsworn encampment outside Sky Haven Temple. Now, most of us return to Sky Haven Temple more than once during the main quest. If those Forsworn respawn in three days we have to fight through a new group of Forsworn nearly every time we go back inside. I use a mod that makes enemies respawn in three days and, let me tell you, I quickly wished I had that 30 day respawn back. It was a pain in the ass to have to fight through a new encampment of Forsworn every time I wanted to get back inside that place.
There may be a few other areas like this as well (the Ratway, perhaps?)