Estimated down time between end of Phase 4 and Early Access?

[Kallera]

It does seem odd that the roadmap's phase lengths + the time until launch date don't match. Just to speculate, it could be a mistake and they forgot to update the durations. Or they could be allowing an extra 2-3 weeks in case a beta phase needs to be extended and/or phase 3 starts later than expected.

This isn't new with company projects. You have to plan for time to fix any defects that may come up, and since we're close to finishing, there can potentially mean more time to sift through and correct the problem beneath existing work.