Edit: Part of this test has been invalidated by an oversight and this will be edited. Take or leave the rest, up to you. Cheers and apologies for the misinformation.
TL;DR: Gloves grant +14% duration... and something is still borked with (Saboteur) Dia 3 duration, beyond the Composure bonus.
Alright, so, after both reading and hearing conflicting information concerning whether the bonus to Saboteur from empyrean gloves applies to duration (or only potency), I decided to test it myself. While this knowledge may not be new to some, hopefully I can elucidate a little, clean up the wiki, and provide a modern reference. Edit: Or I can bugger the tests. That works too.
My findings more or less indicate that everyone is partially correct. The data indicates to me that while the gloves do grant a duration bonus, it is only seen on an NM. Using the gloves on a normal mob does not give any increase to duration beyond the 100% from Saboteur. One theory would be that the effect is capped at 100%, but I say nothing with certainty.
Corrected text: It appears that the Saboteur bonus from Empy Gloves applies to duration as well.
I cast 4 diffrent debuffs at a time to give a good spread. Frazzle III, Dia III, Silence, Paralyze II. My goal was to gather maximum data from minimum time. There should be no interaction between them, in fact, casting Frazzle first is a tiny bit more insurance against a partial duration/resist. Thankfully, there were none (ML and gear are crazy, yo).
I have 20/20 ranks in enfeebling duration JP (and some ML to boot).
I used a set linked at the end for each cast.
For timing, I used the time in seconds from my chat log (effect landing, and effect wearing off). I am not worried about a one-second variation, which is frequently present due to transmission time/etc.
I used our buddy, Calfcleaving Chapuli, in Yahse, as my non-NM test mob.
I used Urmahlullu (T3 Zitah) as my NM.
The numbers. Apologize for the formatting, my forum markdown skills are woefully absent. I tried to use the table feature and failed miserably.
Please note the Dia 3 times, more on that at the end.
On Chapuli:
Frazzle 3 - Base: 321 (
expected 320), Sabo: 621 (
620),
Sabo w/Gloves: 621 (620)
Dia 3- Base 201 (
200), Sabo:
401 (380), Sabo/G:
401 (405.2)
Silence- Base 140 (
140), Sabo: 261 (260),
Sabo/G: 261 (260)
Paralyze II- Base 140 (
140), Sabo: 260 (
260), Sabo/G: 278 (
276.8)
My take on this test: Almost all as expected. Saboteur adds 100% to the base, and JP add 20s after that.
Dia 3 is discrepant.
Expected Dia III duration using [Duration *(1 + Saboteur)] + 20:
180 * 2 + 20 = 380 seconds for Saboteur
180 * 2.14 + 20 = 405.2 seconds for Saboteur w/gloves.
Where is the extra 20s coming from under Saboteur? Why is the number the same with the gloves on?
On Urma:
Frazzle 3 - Base: 320 (
320), Sabo: 395 (
395), Sabo/G: 438 (
437)
Dia 3 - Base: 200 (
200), Sabo: Test 1:250 Test 2:
250 (245), Sabo/G:
251 (270.2)
Silence - Base: 141 (
140), Sabo: 171 (
170), Sabo/G: 188 (
186.8)
Paralyze - Base: 141 (
140), Sabo: 171 (
170), Sabo/G: 188 (
186.8)
All durations are increased for 25/39% over base... except for Dia 3.
Expected Dia III duration using [Duration *(1 + Saboteur)] + 20:
180 * 1.25 + 20 = 245 seconds for Saboteur
180 * 1.39 + 20 = 270.2 seconds for Saboteur w/ Gloves
About Dia 3: FWIW, for testing sake, I had a 99 friend (129 JP, with 1 rank in enf. duration), test on a normal mob, and he timed a duration of 183 and 181 seconds with saboteur, and approx 360 seconds with saboteur (no gloves)... This indicates that the base duration is still, in fact, 180 seconds and not much else.
Interestingly enough, the Dia 3 duration on an NM under Sabo (gloves or not) is 1.25 x 200. I wonder if Dia 3 is using a variant of the normal enfeebling formula. Regardless, something beyond my understanding is at play here. It may be that my understanding of the formula is flawed, and the way I am applying it gives me correct durations for every other spell but Dia, or there may be something else at work here.
For the record, the set:
Base and Sabo test set (add Lethargy +3 hands for sabo bonus testing)
sets.exported={
main="Naegling",
sub={ name="Thibron", augments={'TP Bonus +1000',}},
range="Ullr",
ammo="Chapuli Arrow",
head={ name="Nyame Helm", augments={'Path: B',}},
body={ name="Nyame Mail", augments={'Path: B',}},
hands={ name="Nyame Gauntlets", augments={'Path: B',}},
legs={ name="Nyame Flanchard", augments={'Path: B',}},
feet={ name="Nyame Sollerets", augments={'Path: B',}},
neck="Incanter's Torque",
waist={ name="Acuity Belt +1", augments={'Path: A',}},
left_ear="Malignance Earring",
right_ear={ name="Leth. Earring +1", augments={'System: 1 ID: 1676 Val: 0','Accuracy+12','Mag. Acc.+12','"Dbl.Atk."+4',}},
left_ring="Stikini Ring +1",
right_ring="Shneddick Ring",
back={ name="Aurist's Cape +1", augments={'Path: A',}},
}