Phonetics and the IPA 9, Exercise 2: classifying VOT (velar stops)

55 ms   weakly aspirated (the 50-60 ms band). Aspiration is present but
        weak; whether a listener hears it clearly is a perception question
        the source does not answer.
25 ms   unaspirated (the 20-30 ms band). The page also says 30 ms or less
        for [k] counts as tenuis, i.e. inaudible aspiration.
110 ms  strongly aspirated (over 100 ms).

For comparison, the source gives English [kʰ] at about 80 ms and Navajo [kʰ]
at about 160 ms.