Does kava kava work instantly?

I'm curious to know, does KAVA kava really work instantly as some claim? It's been touted for its relaxing and calming effects, but I'm wondering if the results are truly immediate or if there's a more gradual onset. I'm interested in understanding the science behind it, and if there are any factors that could affect how quickly it takes effect. Can you help me gain a clearer understanding of this popular herbal remedy?