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Several next-generation experiments aim to make the first measurement of theneutrino flux from the Carbon-Nitrogen-Oxygen (CNO) solar fusion cycle. Wecalculate how much time these experiments will need to run for in order tomeasure this flux with enough precision to tell us the metal content of theSun's core, and thereby help to solve the solar metallicity problem. Forexperiments looking at neutrino-electron scattering, we find that SNO+ willmeasure this CNO neutrino flux with enough precision after five years in itspure scintillator mode, provided its $^{210}$Bi background is measured to 1%accuracy. By comparison, a 100~ton liquid argon experiment such as Argo willtake ten years in Gran Sasso lab, or five years in SNOLAB or Jinping. Borexinocould obtain this precision in ten years, but this projection is very sensitiveto background assumptions. For experiments looking at neutrino-nucleusscattering, the best prospects are obtained for low-threshold solid statedetectors (employing either germanium or silicon). These would require newtechnologies to lower the experimental threshold close to detection of singleelectron-hole pairs, and exposures beyond those projected for next-generationdark matter detectors.

CNO Neutrino Grand Prix: The race to solve the solar metallicity problem