Well, with my Other Realm series as a whole (with all the inside-series and stories I have left planned to work on in my head), a good....30, 40 years? Just with the Frost Family Series I'm working on now, it'll be 6-7 books. Plus I need to do a series for the Canis, Fae, and Westa families. Then there's the individual stories exploring the "Human Rights Act" brought about by Lady Nisha Frost, as well as the Souls story and the (possible?) series Switched at Death may turn into. Let alone the 7 other stories/series I only have a tiny inkling about and so have no real plans for. Oh! Yes, I almost forgot. I have to keep reminding myself that Slendie (Slender Man) needs his own story as well. Too many readers enjoyed his character not to.
But, yes...Oh my, I have my work cut out for me. 

Seeing it all laid out there in plain words really is quite intimidating. But! In a year I finished the 1st drafts of 5 of the Frost Family books, so that's something at least! Now to keep up my efforts getting the 2nd drafts of them worked through and finished.