Breakdown of activities during routine operations. The blue bars provide on-sky data that are simultaneously valuable for science, target characterisation, and calibration purposes; the instruments take additional calibration data while the data processing units are busy with the science exposures, and while the telescope is slewing. The yellow bar represents pure hardware calibration with little or no astrophysical relevance. Unallocated time arises because the survey runs out of unobserved sky areas (Sect. 4.1.2).