This is false. The document from Magdalena specifically uses an example where the DK uses BoS 3 times, twice with HRW and once without.
"Indeed, his uptimes were nothing special.
Cast 1: 46 seconds
Cast 2: 28 seconds
Cast 3: 54 seconds"
Graph of DK's Rotation
7.1.5: The road to Breath of Sindragosa’s resurgence