How quick could an adder bite kill a cat?

Adders are not aggressive snakes,

and they will only bite if they are disturbed. Although adder bites

can be painful, they are rarely serious. For example, about 70% of

adder bites only result in pain and swelling in the area of skin

that was bitten There have only been 14 reported deaths caused by

adder bites, with the last death occurring in 1975.