persistence

(noun) the property of a continuous and connected period of time. Synonyms: continuity.

(noun) persistent determination. Synonyms: doggedness, perseverance, persistency, tenacity, tenaciousness, pertinacity.

(noun) the act of persisting or persevering; continuing or repeating behavior. Synonyms: perseverance, perseveration. Example: "His perseveration continued to the point where it was no longer appropriate."