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The study of the flux-flow instability in superconducting materials has recently gained renewed attention due to its potential implications for the use of the analyzed materials as micrometer-sized superconducting detectors for single photons. The values of the quasiparticle relaxation time (τ E) measured for these detectors are affected by pinning properties. Here, we report electric transport properties of NbReN microstrips of different quality. For the strip characterized by high resistivity, and large critical currents and pinning, we estimate a value of τ E that is almost two orders of magnitude larger compared to that of another strip with a smaller value for the critical current, for which we measure τ E ∼ 12 ps. This low value is comparable to those reported in the literature for microstrips made of other highly-disordered superconductors. Our results suggest that NbReN microstrips have great potential for the realization of superconducting single-photon detectors, depending on further optimization of their fabrication process and the superconducting properties affected by it. • Flux-flow in superconductors gains attention for single-photon detectors. • τ E in NbReN microstrips suggests competitive detector performance. • Optimization of device geometry and fabrication can enhance performance. [ABSTRACT FROM AUTHOR]