Books like The Lives Of The Twelve Caesars
Gaius Suetonius
The Lives Of The Twelve Caesars is 318 pages, about 5 hours 50 minutes at 250 words a minute.
12 books to read next
How long each takes
Caligula 6.6 h 
Cornelius Nepos 4.8 h 
Lives 8.6 h 
Historiae Philippicae 6.2 h 
Dynasty 9.6 h 
Roman History 6.4 h 
How to Think Like a Roman Emperor 5.6 h 
Eminent Victorians 5.8 h 
The True History of the Conquest of New Spain 8.8 h 
The Book of Five Rings 2.3 h 
Napoleón 17.0 h 
The Last Mughal 10.3 h Bar height shows length. Estimated at 250 words a minute.