Upvote:6
Wikipedia lists the total casualties from the Terror at a much more reasonable tens of thousands:
The death toll ranged in the tens of thousands, with 16,594 executed by guillotine (2,639 in Paris),2 and another 25,000 in summary executions across France.
The Terror only lasted 9 months after all.
Update:
While it is certain that a few tens-of-thousands were guillotined during the Terror, the wheels of Justice still rolled slowly. For one, a certain Josephine Beauharnais was imprisoned for several months at the end of the Terror awaiting execution:
Considering Joséphine as too close to the counter-revolutionary financial circles, the Committee ordered her arrest on 19 April 1794. A warrant of arrest was issued against her on 2 Floréal, year II (21 April 1794), and she was imprisoned in the Carmes prison until 10 Thermidor, year II (28 July 1794).
Her husband was accused of having poorly defended Mainz in July 1793, and considered an aristocratic "suspect", was sentenced to death and guillotined, with his cousin Augustin, on 23 July 1794, on the Place de la Révolution (today's Place de la Concorde) in Paris. Joséphine was freed five days later, thanks to the fall and execution of Robespierre, which ended the Reign of Terror.