How long can DNA in saliva last outside of the body?

DNA in saliva can last for several hours to several days outside the body, depending on environmental conditions such as temperature, humidity, and exposure to UV light. In optimal conditions, DNA can remain intact for weeks or even months. However, degradation begins shortly after the saliva is exposed to air, making it less stable over time. Thus, while DNA can be retrieved from saliva after some time, its quality diminishes significantly as time passes.