Does tenacity decrease Warwicks ult damage?

Tenacity reduces the time of crowd control effects(such as a suppress)

So if we take Warwick's ult :

ACTIVE: Warwick blinks to target enemy champion, suppressing the target for 1.8 seconds and damaging the target 5 times in 1/3-second intervals. Warwick gains 30% life steal for the duration. Each of his strikes triggers on-hit effects and benefits from life steal and full stacks of Eternal Thirst.

And he uses his ult on a champion with 35% tenacity making the suppress last for 1.17.
This is not enough time to do 5 attack with a 1/3 second interval.

Does this mean that he will only do 3 attacks? or will he still do damage after the target has broken free?

2 Answers

Tenacity: The duration of stuns, slows, taunts, fears, silences, blinds and immobilizes are reduced by 35%. 

Suppress is not affected by tenacity.

Source:

Tenacity does not reduce Suppression or Airborne, Quicksilver Sash/Mercurial Scimitar actives WILL prevent the rest of the damage, but that's not tenacity.

See this question for more details. How does Tenacity work?