As they can't take a blood meal from people the fleas will eventually die off (as they need a blood meal to produce eggs), although it's possible that your human family might get bitten frequently until that happens. ... It's not suitable for use on your hard furnishings as fleas don't normally reside in these places.

How long do fleas live in your house?

How Long Do Fleas Live In Your House? The average life cycle of a flea is about 100 days, but fleas' lifespans can be quite variable. If conditions are favorable, these insects can even live indoors for up to a year!

How long will fleas last without a pet?

Fleas prefer to wait and jump onto a passing animal. Once aboard, they remain until they are dislodged or groomed from the animal. Without a host, adult fleas live only a few days to 2 weeks. On short-haired cats and dogs fleas survive an average of 8 days; they live longer on long-haired animals.