Some NW mechanics questions

Kalo, dropping Alchemist could be JUST ABOUT the worst decision you could make.

In most cases, I would question the use of Sudden Attack all together, seeing as that attack is going to be pitiful damage-wise.

Thanks Tyki, I am fully aware of the risk I am choosing to take. I do question the use of +2% dps as well as the hassle you have to go through to achieve it, not only messing up your build. That's why I'm leaning more towards Booster, even though a 130% dmg increase could be nice and tempting to look at sometimes.

I still need more help with poisonsling, first, the table.

Poison Sling
Description: Throw a bomb that makes a poisonous cloud. Monsters in the Venom Cloud continuously take damage.
Comment: This move works very similar to a Pirate's Grenade. You charge up Poison Sling. The longer you charge it, the further the grenade will fly. On impact, the grenade explodes dealing damage and releases a purple poison cloud. You have full freedom of movement while charging. The poison from this skill actually stacks with the poison from Venom Star, making it quite deadly. The impact hits 6 monsters at all levels.
Max Level: 30

1	MP -21	104% impact damage	51% probability	4 second duration [noparse][/noparse]
2	MP -21	108% impact damage	52% probability	4 second duration [noparse][/noparse]
3	MP -22	112% impact damage	53% probability	4 second duration [noparse][/noparse]
4	MP -22	116% impact damage	54% probability	8 second duration [noparse][/noparse]
5	MP -23	120% impact damage	55% probability	8 second duration [noparse][/noparse]
6	MP -23	124% impact damage	56% probability	8 second duration [noparse][/noparse]
7	MP -24	128% impact damage	57% probability	12 second duration [noparse][/noparse]
8	MP -24	132% impact damage	58% probability	12 second duration [noparse][/noparse]
9	MP -25	136% impact damage	59% probability	12 second duration [noparse][/noparse]
10	MP -25	140% impact damage	60% probability	16 second duration [noparse][/noparse]
11	MP -26	144% impact damage	61% probability	16 second duration [noparse][/noparse]
12	MP -26	148% impact damage	62% probability	16 second duration [noparse][/noparse]
13	MP -27	152% impact damage	63% probability	20 second duration [noparse][/noparse]
14	MP -27	156% impact damage	64% probability	20 second duration [noparse][/noparse]
15	MP -28	160% impact damage	65% probability	20 second duration [noparse][/noparse]
16	MP -28	164% impact damage	66% probability	24 second duration [noparse][/noparse]
17	MP -29	168% impact damage	67% probability	24 second duration [noparse][/noparse]
18	MP -29	172% impact damage	68% probability	24 second duration [noparse][/noparse]
19	MP -30	176% impact damage	69% probability	28 second duration [noparse][/noparse]
20	MP -30	180% impact damage	70% probability	28 second duration [noparse][/noparse]
21	MP -31	184% impact damage	71% probability	28 second duration [noparse][/noparse]
22	MP -31	188% impact damage	72% probability	32 second duration [noparse][/noparse]
23	MP -32	192% impact damage	73% probability	32 second duration [noparse][/noparse]
24	MP -32	196% impact damage	74% probability	32 second duration [noparse][/noparse]
25	MP -33	200% impact damage	75% probability	36 second duration [noparse][/noparse]
26	MP -33	204% impact damage	76% probability	36 second duration [noparse][/noparse]
27	MP -34	208% impact damage	77% probability	36 second duration [noparse][/noparse]
28	MP -34	212% impact damage	78% probability	40 second duration [noparse][/noparse]
29	MP -35	216% impact damage	79% probability	40 second duration [noparse][/noparse]
30	MP -35	220% impact damage	80% probability	40 second duration [noparse][/noparse]

Let's break it down. There are three, no, two noteworthy characteristics of this skill mentioned in the tables: probability and duration. Please correct me if I'm understanding this incorrectly.
- Probability: chance of the mist inflicting the "poisoned" state on the monster.
- Duration: how long the mist lasts.

Then comes the need to understand the mechanics of the "poisoned" state:

For every short interval, a fraction of the monster's HP (%-based) is deducted until nuked.

Questions are:

• How long exactly is this interval? Guessing 1 second
  
• How large is this fraction? Guessing 1/40 or 2.5%
  
• How long does this state last? Guessing over 40 seconds

Answers much appreciated.