I don't agree with the page too, it seems better to make terms on order of magnitude may be (10s of ms, 100s of ms), but in their favor the exact times might no

I don't agree with the page too, it seems better to make terms on order of magnitude may be (10s of ms, 100s of ms), but in their favor the exact times might not be hard limits but maxima in terms of latency, with the hope that you can be better. A point against me is specific numbers (ones that are essentially memorized by every programmer as powers of two) are easy to remember and good for messaging purposes.