PHANGS–ALMA observing conditions for individual observations. Top left: duration, from start to finish, of individual observing blocks observed with the 12 m array, 7 m array, and total power telescopes. Gray points and error bars show the median and 16%–84% range of the duration of individual observations, which are typically 1–1.5 hr. The remaining three panels show the mean elevation and precipitable water vapor (PWV) measured in the atmosphere for each individual block. Gray regions show the 16%–84% range of each quantity and black lines show the median. A thick gray line shows ALMA’s fifth octile of PWV, ∼1.8 mm, the nominal threshold for Band 6 (230 GHz) observations.