The Pet Shed Petcyclopedia explains that a flea can live for a little over 130 days when it has access to a host. When a flea loses its host, it must find a new one as quickly as possible. According to 1-800-PetMeds, a little over half of newborn fleas may be able to survive for two months without a host if their environment is humid enough. On the other hand, newly hatched fleas in a dry and cold environment usually survive a few days at the most without feeding.
https://www.reference.com/home-garden/long-can-fleas-live-host-c0d2c4a58a16cc35
Their legs are long, the hind pair well adapted for jumping; a flea can jump vertically up to 7 in (18 cm) and horizontally up to 13 in (33 cm), making the flea one of the best jumpers of all known animals (relative to body size), second only to the froghopper.
https://en.wikipedia.org/wiki/Flea
The entire cycle can last as short as a few weeks or as long as months, depending on the environmental conditions. PetMD states the ideal conditions for flea propagation are temperatures ranging between 70 and 85 degrees Fahrenheit and 70 percent humidity. An adult flea can live up to two weeks without a host.
https://www.cuteness.com/article/long-do-fleas-live-host
A female flea will begin laying eggs about 24 hours after enjoying her first blood meal. Fleas pass their time on their host eating, breeding and laying eggs. Usually, an adult flea will live for two or three months. Fleas are more than irritating; they can cause tapeworm as well as flea allergies in pets.
https://www.cuteness.com/article/long-do-fleas-live-host
The Pet Shed Petcyclopedia shares an unsettling statistic about how little it takes for a flea infestation to take over a house: as long as their environment is humid enough, just ten female fleas can become a quarter of a million within one month.
https://www.reference.com/home-garden/long-can-fleas-live-host-c0d2c4a58a16cc35
However, completely developed adult fleas can live for several months without eating, so long as they do not emerge from their puparia. Optimum temperatures for the flea's life cycle are 21 °C to 30 °C (70 °F to 85 °F) and optimum humidity is 70%.
https://en.wikipedia.org/wiki/Flea
How long is the life span of a flea? A flea might live a year and a half under ideal conditions. These include the right temperature, food supply, and humidity. Generally speaking, though, an adult flea only lives for 2 or 3 months. Without a host for food, a flea's life might be as short as a few days. But with ample food supply, the adult flea will often live up to 100 days. Cornell Entomology Fact Sheet on Fleas - This fact sheet provides the basics on the flea species, behavior, ecology, life history, and management.
http://loc.gov/rr/scitech/mysteries/flea.html
She's a productive parasite, laying up to 40 eggs in a day. She lays her eggs where she feeds -- in your pet's fur -- and eventually the eggs drop from your pet's coat as he goes about his daily routine. Eggs can hatch as quickly as two days or take as long as two weeks, depending on the environment.
https://www.cuteness.com/article/long-do-fleas-live-host
A flea might live a year and a half under ideal conditions. These include the right temperature, food supply, and humidity. Generally speaking, an adult flea only lives for 2 or 3 months. Without a host for food a flea's life might be as short as a few days. With ample food supply, the adult flea will often live up to 100 days. Newly emerged adult fleas live only about one week if a blood meal is not obtained.
https://en.wikipedia.org/wiki/Flea
Fleas are wingless insects, 1/16 to 1/8-inch (1.5 to 3.3 mm) long, that are agile, usually dark colored (for example, the reddish-brown of the cat flea), with a proboscis, or stylet, adapted to feeding by piercing the skin and sucking their host's blood through their epipharynx.
https://en.wikipedia.org/wiki/Flea
how long can fleas live
Fleas can live for 100 days. Fleas can live more than 100 days.  