stamina
/ˈstæmənə/ noun C1- The energy and strength for continuing to do something over a long period of time; power of sustained exertion, or resistance to hardship, illness etc. · He has a lot of stamina. I suppose that's why he can run for a long time.
Plural staminas
From the library
Without the stringent discipline demanded by the pilothouse, it is highly doubtful that Clemens would have developed the extraordinary stamina required to craft his enduring masterpieces.
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