Colleen Gleason books in order
5 books in the catalogue, about 34 hours of reading in all; the shortest takes 6 hours and the longest 7 hours.
1 series and 1 standalone book in the catalogue.
The Gardella Vampire Chronicles
5 books
Rises the Night 6.5 h 
The Rest Falls Away 7.0 h The Bleeding Dusk length not known
When Twilight Burns 6.6 h 
As Shadows Fade 6.4 h 