A tick can live on a human body for a few days up to several weeks, depending on the species of the tick and the environment it is in. The tick's life cycle is completed in three stages: the egg, the larvae, and the adult. When the adult tick finds a suitable host, it will attach itself to the host's skin and begin to feed on its blood. The tick can remain attached to the host for several days as it sucks the host's blood. During this time, the tick will lay eggs, which hatch into larvae. The larvae will then find another host to feed on, and the cycle will repeat.
Once the tick has finished feeding, it will fall off the host and die. Depending on the species, this can take anywhere from two to fourteen days. The tick's lifespan can also be affected by the climate and the time of year, as some species are more active in warmer climates and during the summer months. Additionally, the lifespan of a tick can be shortened if it is removed from the host's skin before it has completed feeding.
In general, the presence of a tick on a human body should be taken seriously. Ticks can transmit a variety of illnesses, such as Lyme disease, so it is important to take steps to protect yourself from ticks and to remove any ticks that you find. Prompt removal of the tick can help minimize the potential for infection.