Measure personal reading rate through self-timed practice and explain how appropriate rate shifts with reading purpose.
There is no single "correct" reading speed -- the right rate depends entirely on what you are reading and why. Skimming to find one specific answer, reading a novel for enjoyment, and slowly working through a dense, unfamiliar paragraph all call for genuinely different paces, and a mature reader shifts rate deliberately rather than reading everything the same way out of habit.
A simple way to find your own baseline: read from a comfortable, just-right book (from week 28's ladder) for exactly one minute, then count the words read and check comprehension with two or three quick questions about what you just read. Speed without comprehension is not actually useful reading -- if your rate is high but you cannot answer basic questions about what you read, the pace was too fast for that particular text and purpose.
Mastery looks like: They can measure their own reading rate on a suitable text, check comprehension alongside it, and explain how appropriate rate shifts with purpose.
Common stumbles: Treating a higher words-per-minute count as automatically better, without checking whether comprehension held up at that pace.