For now, we can use def2-ma-QZVP to establish the basis-set limit. This reveals that HF-3c results are closer to ωB97X-V/def2-ma-SVP than they are to ωB97X-V/CBS. However, the minimal-basis HF-3c method can be run in a tiny fraction of the computational cost, meaning tens of hours for HF-3c versus hundreds of hours for ωB97X-V/def2-ma-SVP, or ∼ 10 4 h for ωB97X-V/def2-ma-QZVP.