回答編集履歴
1
計算式間違い
    
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         @@ -5,7 +5,7 @@ 
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       5 
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            ```
         
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       6 
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            	float startTime = Time.realtimeSinceStartup;
         
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            -
            	while( 
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 8 
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            	while(Time.realtimeSinceStartup - startTime + Time.deltatime < 3){
         
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            		//実際の処理
         
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            		yield return null;
         
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            	}
         
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