Books like Top Secret Twenty-One
Janet Evanovich
Top Secret Twenty-One is 347 pages, about 6 hours 22 minutes at 250 words a minute.
12 books to read next
How long each takes
Flesh and Blood 8.5 h 
The Thousand-Dollar Tan Line 5.9 h 
Personal 8.1 h 
Gone Girl 8.7 h 
The Heist 8.6 h 
Concealed in Death 8.1 h 
Festive in Death: 39 9.1 h 
Private L.A. 8.2 h 
W Is for Wasted 9.7 h The Flight Attendant 6.8 h 
As Time Goes By 5.4 h 
Unlucky 13 7.6 h Bar height shows length. Estimated at 250 words a minute.