Here's how buff tics work just based on how they work on the client:
The client has one buff tic timer that counts down the tics every 6 seconds. Each buff's timer is not independent of each others timer, they all tic down at the same time. Every time the client has no buffs the timer is turned off and set fresh when a new buff is applied.
If you're hotting someone who already has buffs on them the longest you'll have to wait is about 6 seconds, the shortest is a fraction of a second; averaging out in the middle of the two.
Given this observation from the client is how I implemented it on spell branch which is a little different than how it's implemented on trunk.
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