This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. Simple past tense and past participle of protract.

adj. Lasting for a long time or longer than expected or usual.

adj. Prolonged; continued.

adj. relatively long in duration; tediously protracted

"U.N. food agencies said Wednesday that 166 million people in 22 countries suffer chronic hunger or difficulty finding enough to eat as a result of what they called protracted food crises."

long   

prolonged    continued   

protract   

acted    compacted    detracted    distracted    exacted    extracted    impacted    overacted    reacted    redacted   

lengthy    tedious    fruitless    arduous    painful    continual    interminable    subsequent    ongoing    long-continued