There are different kinds of Kava euphoria as well.
One kind of Kava euphoria is a state of mind where you are being gently rolled between silky layers of the firmament. I often find myself overwhelmed with joy and clarity. This can last for up to twenty minutes and is what I consider a "peak" Kava experience. Unfortunately, my best memories of this go back to really strong Tudeis, though I have also had it from Stone, Wow, Solomons, Koniak, Nangol, and Kava Roots' Van Select (the winner of the 2016 Best Kava award).
The second kind of Kava euphoria, more common among Borongoru and related varieties, consists of a deep, sleepy, dreamy kind of "stony" feeling. It's a kind of supreme relaxation where problems seem to disappear. Less of a celebration and more of a "forget about it" kind of feeling. Similar to benzos in many respects.