The discretization of its orbital energy levels imposes a quantum description of its electronic structure, replacing thus the so-called plasmon bands by discrete electronic transitions. Within the latter regime, numerous efforts were dedicated to the modeling of optical properties of noble metal nanoclusters with the time-dependent variant of density-functional theory (DFT) in its linear-response formalism (LR-TDDFT). In the 2010s, pioneered investigations were dedicated to methodological developments and started by focusing on rather small silver and gold clusters in the gas phase. In time, they fast evolved toward the nanometric size (i.e, clusters containing more than ∼50 atoms), and went even beyond the gas phase by taking into account the colloidal environment of the nanocluster. In the race for computing optical properties of larger and larger noble metal nanoclusters, LR-TDDFT fast shows its limits. Its prohibitive cost comes not only from the system size but also from the huge number of excitations to include within the linear-response equations.