I do think its not possible but i suggest you looking at how Time.deltaTime increase by time. Create a variable and set it to something like;
private var a : float = 0;
function Update()
{
a += Time.deltaTime;
Print(a);
}
See how a value increases per frame, then you might have to see the chance whether it is possible to detect that small amount of change in seconds.
Cheers.
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