Are you asking how long it takes for rigor mortis to set in?
Lynn
Hi,
Rigor mortis can start to set in as soon as 10 minutes after death, or it can take several hours depending on the temperature. The colder it is the longer it takes. On average, it has fully set in after about 3 hours.
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will it normally starts with the legs? what condition eyes flips/become white?
It usually starts with the facial muscles and spreads to other parts of the body. The legs may be the first obvious place you notice it. Seizures or other neurological problems could cause your cat's eyes to roll back in their in head so that the white is showing.
Neurological problems are any having to do with the central nervous system which would mainly be caused by the brain. Seizures are when the animal loses awareness of what's going on, the muscles may stiffen, they may be tremors, sometimes their eyes roll back in their head, etc. Here is a link to a page about seizures:
http://www.sniksnak.com/cathealth/seizures.html
There are many different neurological conditions. Some, such as a brain tumor, can definitely cause death within this time frame. Others may never cause death, but only symptoms throughout the cat's life.
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Veterinary Assistant
worked at a vet clinic for 15 yrs, BA in biology, have had cats most of my life