Hm, this is not really a bug.
@3b3f5f8bb8=The:
The Narfell implementation changes the BioWare implementation.
Duration changes as follows:
Summon I & II - 1 Hour + Turn/level;
Summon III & IV - Turn/2 Levels;
Summon V+ - Round/Level.
Please note that animal domain effectively functions as +1 caster level, however, the duration SCHEME will be equivalent to the NEW spell level. That being said, if you cast a summon IV spell, it will summon from the summon V list, but also give you the round/level duration. The creatures that are summoned have also been changed and are determined by the caster's selection, made using the Book of Summons.
I believe 1 turn is 10 rounds.
Can some bigger power move this to an appropriate thread please?