I run a dagger dagger frost aura healing tempust. I noticed that both the frost aura from dagger and the shock aura from dagger have the same duration. It is not using your base duration (3 sec for shock and 7 sec for frost) instead it is 5 seconds each. With runes of radiance it should be about 4 sec shock and 9.3 sec. I hope this is only a bug and will be fixed, because it makes it really hard to chain frost aura if the auras you have, have a different duration then the ones on your allies.