Books like The Grand Sophy
Georgette Heyer
The Grand Sophy is 341 pages, about 6 hours 15 minutes at 250 words a minute.
12 books to read next
How long each takes
An Offer from a Gentleman 7.6 h 
Refining Felicity 3.2 h 
Dark Angel 5.0 h 
Hard Times 6.0 h 
Proof by Seduction 6.9 h 
A Kiss at Midnight 6.8 h 
To Seduce a Bride 7.7 h 
When the Duke Returns 6.9 h 
At Last Comes Love 7.1 h 
Serena 5.3 h 
The Impoverished Viscount 4.1 h 
Persuasion 4.9 h Bar height shows length. Estimated at 250 words a minute.