I had heard the 1 ms number also and did some research some time ago. As far as I understood the 1 ms is for specialised low latency connections and devices not for the every day browsing.

Here are two sources which I found useful at that time https://broadbandlibrary.com/5g-low-latency-requirements/ https://www.linkedin.com/pulse/we-need-talk-low-latency-dean...