24 hours. Scalp laceration occurs clinically, and the time limit of debridement and suture is within 12 hours, and the longest time is no more than 24 hours. If the wound is large, polluted seriously, or the risk of infection is high, it will not be sutured immediately, but wound management, antibiotic treatment and monitoring will be carried out, and suture will be carried out when the wound conditions are suitable.