This is very important, as burn-in time is >400hrs and even >500hrs, while settling-time is >6hrs and preferably >48hrs (once plugged and replugged).
Settling-time is the time between plugging in (connecting) the ICs between two components, then unplugging (unconnecting) the ICs. Even moving the ICs around may require fresh period of settling-time.
KLEI literature states the KLEI™gZero20 ICs require 48 hours settling time to properly settle and 60+ hours if you want superb results.
... so - hopefully - I do expect for even better and better;-)