Left: mass-loss rates versus the duration of the X-ray event of 15 Ibn SNe of the F25 sample observed with Swift XRT. The mass-loss rates were estimated using Eq. (1). Right: parameter space of Margalit et al. (2022), $\tilde{v}{L}_X/v_X$ versus $\tilde{v}{t}_X$. Here we included the X-ray estimates from Type Ibn SN 2006jc (Immler et al. 2008), and Type IIn SNe 2006jd (Chandra et al. 2012) and 2010jl (Chandra et al. 2015). Green and red lines correspond to the slopes of constant CSM radii and CSM masses using Eqs. (2) and (3), respectively. The origin of the X-ray emission associated with SN 2020nxt and SN 2022qhy is likely the host galaxy (open markers).