If you play the phrase as written, it takes one measure in 4/4. So theoretically you could use it anytime you needed a one-measure fill (tempo permitting). I guess it's up to you to decide when and how to use it, but it is a bitchin' lick.
I remember when I took my first or second lesson with Steve, he busted out the nine and I flipped out. "That's the Weckl lick!" It's one of the coolest ever.
