We demonstrate sustained operation of a solid-state thorium-229 nuclear clock using continuouswave absorption at 148.4 nm. In a ${}^{229}$Th:CaF${}_2$ crystal, we resolve four quadrupole components of the D center and a broader O-center resonance. Feedback on the strongest narrow component is updated approximately every 10 s and remains active throughout a 30-h record. A hydrogenmaser-referenced frequency comb measures the output. Above the feedback interval, the fractional frequency instability of the clock output follows approximately $1.29\times {10}^{-11}(\tau /s{)}^{-1/2}$ and reaches $1.24\times {10}^{-13}$ at ${10}^4$ s. A separate 6.6-h run demonstrates feedback on a second quadrupole component. Absorption-derived centers and clock outputs agree within their evaluated uncertainties, while temperature-adjusted comparisons with other segments of the same parent crystal indicate transition-dependent offsets.