DoT tracking Icon - Swipe Ticks instead of remaining duration?

[prime herald]

There's no API to get tick duration/time until next tick.

You'd have to find out how the ticks behave.
One at the start, one at the end, but when unhasted: in which interval does it tick?
And then adjust that on UNIT_SPELL_HASTE firing

Ah, I missed the tag

If it's really 3s flat always

You can just make a combat log trigger for spell aura applied -> source unit player -> your spell Id -> timed hide 3s

And a spell periodic damage -> source unit player -> your spell Id -> timed hide 3s

That'd show the aura, progressing for 3s, when you apply the debuff and after each tick

If you instead want a singular progress bar for the whole duration, with ticks placed every 3s, then that's more involved

But if it's just about knowing when the next tick happens, the first one should be enough no?

[prime herald]

I'm not home, I can't look at that

Set it to required for activation any, if you didn't