Guppies give birth to live young, rather than laying eggs, and there is no specific time frame for how long it takes for a guppy to give birth. The gestation period for guppies varies depending on water conditions, temperature, and the individual guppy. It typically takes around 4 to 6 weeks for a guppy to become pregnant and give birth to live fry, although this can range from 2 to 8 weeks in some cases.