Spot on pippettes for cats...?

I use those spot on flea killers but i find they take up to three to fours days to really start to work, this flea is bound to land on your cat and die, but don't worry every where your cat lies on carpets , cushions etc, anything on there will be killed , i had the same problem last year but within four days all trace of fleas had gone and as long as you keep up with the treatment regularly as directed you should have no more problems.