[jasonwatkinspdx]

In this context, 7ms refers to the size of the TrueTime uncertainty interval, which is different from the typical instantaneous clock error. TrueTime returns an interval that is guaranteed to contain the absolute idealized physical "now." So this interval represents a worst case boundary, and if a system using TrueTime is able to separate events by the current interval, for example by forcing a committer to wait it out, then it can provide a temporal order that reflects the absolute real world physical order, despite any clock uncertainty. It's a bit different to think about than how we typically work with time, but it's a powerful primitive in a globally distributed system.