QPO lifetime distribution over all the 2018 March–June Insight-HXMT observations in units of cycles. The left panel shows the LE energy band, the middle panel shows the ME, and the right panel shows the HE. In all panels, the blue histogram is the lifetime distribution of QPOs with frequencies < 0.2 Hz. The red histogram is the distribution for QPOs with frequencies of 0.2–0.4 Hz. The green histogram shows QPO frequencies of 0.4–0.63 Hz. The black histogram is the lifetime distribution for all QPOs of any frequency. The total lifetime distribution in each panel has been fitted with a Gaussian (solid black curve), and the dashed black lines mark the Gaussian mean lifetime and the value of 1σ above the mean.