Primary closure of incised wounds must be done within:
WOUNDS CAN BE CLOSED BY 

Primary suture: 

  - Clean wounds
  - Selected contaminated wounds after thorough wound toileting and debridement

Delayed primary suture:

 - Heavily contaminated wounds
 - Wounds in which wound toileting has been delayed for 6-8 hours

Left open to heal by secondary closure
2 hours
4 hours
6 hours
12 hours