I have just read this article and I need help. Accordingly when this little device needed to slow down when approaching Saturn it fires it's rocket engine to brake, and it says it (must) last 96 minutes. Less or more than that it would end in loss of the device. Anyone can shed a bit of light here?

But I remember I heard that the Apollo rocket fires 15 tons of fuel per second. If you don't believe me than here is the quote;

"The Saturn V rocket's first stage carries 203,400 gallons (770,000 liters) of kerosene fuel and 318,000 gallons (1.2 million liters) of liquid oxygen needed for combustion. At liftoff, the stage's five F-1 rocket engines ignite and produce 7.5 million pounds of thrust."

https://www.csmonitor.com/Science/Spacebound/2017/0910/Ringing-success-H...