Brake in for the Aesthetix Calypso and Rhea

If you could take a minute to help me with a question, it would be appreciated. I am borrowing a new just out of the box Aesthetix Rhea phono preamp and Calypso line stage from a dealer with intention to buy depending on how it sounds in my system. He just sold his demio units. How long does it take to break in the two units? I have approximately 20 hours on the Calypso and 3 hours on the Rhea.
The Calypso is starting to sound wonderful espcially in the midrange except for a slight upper midrange hardness that I think may be slowly going away, a slight loss dynamics and a drop dark. The Rhea nedds alot of time and is still very tight and very hard in the upper midrange but I've only played about 9 album sides. The unit is set for 250 ohms and 62db of gain. Easiest settings ever.
I need to make up my mind this week so any help and insight is appreciated.

Thanks in advance,
Al

Sota, SME V, Benz 2 (.6mv)
AR CD3
Coherence I Series I (Original)(Trying to replace)
Rowland 8ti
Mirage M-1
Transparent Ultra xl cable