How to time Charm for 18 seconds perfectly?

[busted]

I haven't tried this but it might* work... Make a macro that casts charm, pause for 3 sec, then hide and you might get a clean break and recharm...

Personally, I do it manually like so: I will charm, cast 3 songs, wait a sec, then start recharm on mob. Cancel song if charm still not broken and restart song to try and time it. You start to get a hang of it after a while.

Also for the charming pros out there, get a FT1 item for double mana regen.