The heat period of sheep is

The heat period of sheep is 24 - 48 h.
Estrus or “heat” is a period during the reproductive cycle when female animals become sexually receptive, signaling they are ready for mating.
Length of the estrous cycle in sheep is on average 17 days but can vary between 14 and 19 days. Average duration of estrus is 24 to 48 hours, with ovulation occurring toward the end of estrus or approximately 24 hours after the onset of estrus.