As long as you're still bleeding or the cut continues to reopen. I’ve know people who have had severe cuts that would reopen repeatedly for days after. They got stitches days later. read more
Depends on where: The longer a cut is left open before closing with sutures the higher the risk of infection after closing. Some areas such as the face have such an abundant blood supply that it may be safer to close an older cut than say one on the leg. read more