The longer that the tooth is out of the socket, the less chance of survival. Options, if less optimal, remain available even if a tooth has been out of the mouth for longer than 60 minutes.
Andreasen JO, Borum MK, Jacobsen HL, Andreasen FM. Replantation of 400 avulsed permanent incisors. Part 4. Factors related to periodontal ligament healing. Endod Dent Traumatol 1995;11:76-89.
American Association of Endodontists. Recommended Guidelines of the American Association of Endodontists for the Treatment of Traumatic Dental Injuries. Chicago; 2004.