Joan Aiken books in order
40 books in the catalogue, about 204 hours of reading in all; the shortest takes 2 hours and the longest 20 hours.
3 series and 33 standalone books in the catalogue.
Wolves Chronicles
12 books
The Whispering Mountain 4.7 h 
The Wolves of Willoughby Chase 3.3 h 
Black Hearts in Battersea 4.5 h 
Nightbirds on Nantucket 3.9 h The Stolen Lake length not known
Limbo Lodge length not known
The Cuckoo Tree 5.6 h Dido and Pa length not known
Is length not known
Cold Shoulder Road length not known
Midwinter Nightingale length not known
The Witch of Clatteringshaws length not known
Paget family
3 books
The Smile of the Stranger 4.8 h The Lightning Tree length not known
The Young Lady from Paris length not known
Felix trilogy
3 books
Standalone books
Ghost Stories 5.5 h 
The Kingdom and the Cave 2.9 h 
The Silence of Herondale 3.4 h 
Beware of the Bouquet 3.7 h 
Dark Interval 4.4 h 
Necklace of Raindrops 1.9 h 
Night Fall 2.3 h 
The Embroidered Sunset 4.6 h 
A Cluster of Separate Sparks 4.2 h 
Died on a Rainy Sunday 2.4 h 
Arabel's Raven 1.8 h 
Midnight Is a Place 5.6 h 
Castle Barebane 5.7 h 
The Five-Minute Marriage 5.6 h 
The Shadow Guests 3.2 h 
65 Great Spine Chillers 12.3 h 
Mansfield Revisited 4.1 h 
If I Were You 7.6 h 
Give Yourself a Fright 3.3 h 
Jane Fairfax 4.7 h 
Return to Harken House 2.2 h 
The Haunting of Lamb House 3.7 h 
All Hallows' Eve 4.5 h 
Haunting Christmas Tales 4.9 h 
Tales of Horror and Mystery 6.9 h 
Eliza's Daughter 6.7 h 
Emma Watson 4.1 h 
Mystery Stories 4.1 h 
Scary! 4.1 h 
The Youngest Miss Ward 5.8 h 
Prentice Hall Literature--Timeless Voices, Timeless Themes--Copper Level 6.2 h 
Prentice Hall Literature--Timeless Voices, Timeless Themes--Gold Level 19.8 h 
The Best Science Fiction and Fantasy of the Year, Volume Three 9.1 h