Hi Vortak
The 30 sec buff on TellMeWhen is spell ID 20925.
For mine I track the buff as I like to see when it's up, to be honest, you don't really need to know when it's about to run out.
If you track that it's on you, you should be throwing a GCD into SS when you've got a spare one, it shouldn't really get chance to drop to ~5 seconds.
- Renns