Solar granulation characteristic timescales at different activity levels. Upper panel: best-fit granulation characteristic timescale computed on 10 d-intervals of the HARPS-N (circles with light blue error bars) and NEID (diamonds with dark blue error bars) solar RV time series. The abscissa shows the activity level as traced by the average S_MW index within each interval. The markers are color-coded by the average time of the points within each interval. The gray-shaded region shows the best-fit granulation timescale with ±1σ uncertainties obtained by Al Moulla et al. (2023) from a combined data set of HARPS-N and HARPS solar RVs. Lower panel: same as the upper panel, but for the supergranulation timescale.