Taxman seems to beat me to every thread!
Hes right though, it has a 4hour half life, so you need to run it everyday. About an hour before workouts would be a good time. If its a particularly large dose, the split morning/evening.
If you wanted to keep "stable" blood levels you'd need to dose evenly every 3 hours, which just is impractical, which is why most opt for just dosing pre-workout.