I used to think I must have kava tolerance, but I think I'm just getting better at drinking it. I can drink it all day long and I always feel great all the time. Not sure what do compare it to as I don't know anything else any more. Even when I'm not actively drinking it, it's still at work making me feel good.
But it did take me 2 months of daily drinking at first before I felt anything. And what I feel from borogoru is about what you describe.