Some NW mechanics questions

So 30 secs at max lvl

It maxes at 30. 70-30 = 40 seconds

and I can bring a mob down to 1 HP with lvl 1 sling?

level 1 Sling only lasts 4 seconds, so sure, if you want to poison the mob ceiling(69/4) = 18 times.

Since we only have 120 SPs for 2nd job and 110 of which already went to 'apparent' skills: mastery, critical, haste, FJ, and Vampire which leaves me with 10 SPs for either Sudden Attack or Booster. This leaves me with 2 possible solutions:

- Having lvl 1 Sudden Attack just for the 'fun' and convenience of attacking without having to cancel ds, lvl 9 booster.
- Getting both and substitute missing SPs with a combined sacrifice of Alchemist and Avenger, probably getting lvl 10~13 Alchemist and 27~30 Avenger.

You get 121 SP. I'd leave Booster at 10. WHY WOULD YOU DROP ALCHEMIST. DON'T DO IT.