It can take several months of flea medication treatment along with bombing/spraying your home, washing all cats bedding etc. Fleas lay eggs which will hatch weeks down the road. Fleas also cause tapeworms and the cats need to be treated for these also. Here's a real helpful site:
http://edis.ifas.ufl.edu/IG087
Trap-Neuter-Return (TNR) is a full management plan in which stray and feral cats already living outdoors in cities, towns, and rural areas are humanely trapped, then evaluated, vaccinated, and sterilized by veterinarians. Kittens and tame cats are adopted into good homes. Healthy adult cats too wild to be adopted are returned to their familiar habitat under the lifelong care of volunteers
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