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Solid-state electronic spin systems such as nitrogen-vacancy (NV) colorcenters in diamond are promising for applications of quantum information,sensing, and metrology. However, a key challenge for such solid-state systemsis to realize a spin coherence time that is much longer than the time forquantum spin manipulation protocols. Here we demonstrate an improvement of morethan two orders of magnitude in the spin coherence time ($T_2$) of NV centerscompared to previous measurements: $T_2 \approx 0.5$ s at 77 K, which enables$\sim 10^7$ coherent NV spin manipulations before decoherence. We employeddynamical decoupling pulse sequences to suppress NV spin decoherence due tomagnetic noise, and found that $T_2$ is limited to approximately half of thelongitudinal spin relaxation time ($T_1$) over a wide range of temperatures,which we attribute to phonon-induced decoherence. Our results apply toensembles of NV spins and do not depend on the optimal choice of a specific NV,which could advance quantum sensing, enable squeezing and many-bodyentanglement in solid-state spin ensembles, and open a path to simulating awide range of driven, interaction-dominated quantum many-body Hamiltonians.

Solid-state electronic spin coherence time approaching one second