i do this same method and i don't know how you could get through 50(!) dishes in anything less than 15 minutes, unless they're not thoroughly cleaned. 5 minutes

i do this same method and i don't know how you could get through 50(!) dishes in anything less than 15 minutes, unless they're not thoroughly cleaned. 5 minutes is the time it usually takes to do ~1 set of dishes (7-10 items), though that's partially because it lacks the compounding effects you mention.