In emergency medicine, the golden hour (also known as golden time) refers to a time period lasting for one hour, or less, following traumatic injury being sustained by a casualty or medical emergency, during which there is the highest likelihood that prompt medical treatment will prevent death. https://en.wikipedia.org/wiki/Golden_hour_(medicine)
Time is off course at a premium, but there seems to not be anything special about the 60 minute mark.
> It is well established that the patient's chances of survival are greatest if they receive care within a short period of time after a severe injury; however, there is no evidence to suggest that survival rates drop off after 60 minutes
It’s a rule of thumb though and in this case it wasn’t so much about survival rates specifically but rather the condition worsening for those with orange and yellow tags during that time frame.