Now here is the premise of this testing. I have noted that the extended improved invisibility seemed really really short compared to the description on lore. So I thought I would test it out twice in a row to make sure of what I thought.
From
this picture you see I have no bonus to ac, concealment or even invisibility
Now from
this one, you can see the bonus to ac, concealment and invisibility.
And lastly, from
this one, you can see the bonus to ac, concealment and invisibility have all dissipated.
Here is the extracted log of the testing and comparison with extended invisibility.
[CHAT WINDOW TEXT] [Wed Sep 09 13:43:04] Tyillaan Selaama casting Invisibility
[CHAT WINDOW TEXT] [Wed Sep 09 13:43:06] Tyillaan Selaama casts Invisibility
[CHAT WINDOW TEXT] [Wed Sep 09 14:07:07] Tyillaan Selaama: [Tell] invisibility gone
[CHAT WINDOW TEXT] [Wed Sep 09 14:07:38] Tyillaan Selaama: [Tell] extended that is now testing extended improved ivisibility
[CHAT WINDOW TEXT] [Wed Sep 09 14:08:00] Tyillaan Selaama casting Improved Invisibility
[CHAT WINDOW TEXT] [Wed Sep 09 14:08:02] Tyillaan Selaama casts Improved Invisibility
[CHAT WINDOW TEXT] [Wed Sep 09 14:12:32] Tyillaan Selaama: [Tell] extended improved invisibility gone
[CHAT WINDOW TEXT] [Wed Sep 09 14:13:25] Your soul is bound on the Central server.
[CHAT WINDOW TEXT] [Wed Sep 09 14:13:25] Your character has been automatically saved.
[CHAT WINDOW TEXT] [Wed Sep 09 14:27:09] Tyillaan Selaama casting Improved Invisibility
[CHAT WINDOW TEXT] [Wed Sep 09 14:27:11] Tyillaan Selaama casts Improved Invisibility
Now since Tyillaan is level 12, the
lore description of Improved invisibility says that the spell would last 1turn+1 round per level. Which in turn is longer than the
invisibility spell that is only 1 turn per level.
This means that for Tyillaan improved invisibility should last 12turn+12 round total. In terms of minutes though this is the math to know the precise number of rounds.
12 turns*10 rounds= 120
rounds +12 rounds =132 rounds * six seconds each round =792 seconds divided by 60 seconds per minute = 13.2 minutes
Now considering that those were extended spells, the
lore description page states that the duration of spells are doubled when extended. There for, her extended improved invisibility spell should have lasted 26.4 minutes.
If you refer to the screen shots taken, and extracted log, you will see that this is not what is happening. You can notice how ever that Extended invisibility is spot on as it should.