Been practicing these at the moment, slowly working my way up to double-timing them, 100BPM is nice speed, not too slow or fast but a good bridge to reaching 120MPM/60BPM double-time.
When I started learning how to scratch: 5th January 2021
What I've been practicing lately: Tears, Stabs, Transformers, 2 Click Flares & Chirps
Each practice session lasted approximately 15-30 minutes.