Not to be confused with this question, I'm not asking about stasis and I'm interested in continuous application, not a simply chained one.
For how long can a champion be continuously immune to any damage directed at them (doesn't matter if they can or cannot be targeted)?
A valid sample combination:
- Kayle's ultimate
- Zhonya's Hourglass just before the former wears off
A sample invalid combination:
- Zhonya's Hourglass
- Kayle's ultimate
The latter is invalid because there is a small pocket of time during which the champion might theoretically take damage, since Kayle can't cast the ultimate on the champion under Zhonya's while it's active.
What's the longest such valid combination (in seconds, not by number of spells)?