It seems like you might be mistaken about what S&D is? There isn't really a trick method to doing a lot of hair fast. S&D is where you hold up individual strands to light to find splits and snip the individual splits. It takes multiple sessions over quite a long period of time to get 100% of splits in anyone's hair.
"Dusting" hair refers to taking a small amount of hair off the entire length, aka microtrimming.
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