The rate of charge-parity switching in a full-shell superconductor-semiconductor nanowire qubit is measured by directly monitoring the dispersive shift of a readout resonator. At zero magnetic field, the measured switching time scale $T_P$ is on the order of $100\mathrm{m}\mathrm{s}$. Two-tone spectroscopy data post-selected on charge parity is demonstrated. With increasing temperature or magnetic field, $T_P$ is at first constant, then exponentially suppressed, consistent with a model that includes both nonequilibrium and thermally activated quasiparticles. As $T_P$ is suppressed, qubit lifetime $T_1$ also decreases. The long $T_P\sim 0.1\mathrm{s}$ at zero field is promising for future development of qubits based on hybrid nanowires.

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• Superconductivity
• Nanowires
• Semiconductors
• Superconducting qubits