Hi 5thWiggle.
I honestly don't know how long. I haven't even started writing them, though I have them conceptualized. I'm about to move cross-country and it's interfering with my writing time. At the earliest, the next one will be out in 6 months, but more likely 8-10 months.
This book can stand alone. It begins 6 days after "Pelya" and has a definite ending without a cliff hanger. There's more to her story, but it's not dire.
*grin* I love your pronunciation of Ebudae. I have a hard time with character names while reading other books, so it's perfectly understandable. I pronounce it "eh-boo-day"
The name was inspired by the Enya song of the same name. It's beautiful and mysterious.