A spirit weapon skill that was fully leveled had a duration of ten minutes. Jack's legendary-grade Superior Amulet of Summoning doubled that duration to twenty minutes.
So, Spark should have gone out of existence by now, but it was still here crossing swords with Jack.
Jack realized that and disengaged from the fight. "Spark, hold!" He called as he jumped away.
"Are you getting tired, master?" Spark asked. There was a hint of disappointment in his computerized voice.
"No, I'm not getting tired," Jack said. "I want to know why you don't disappear. It should be past your duration."
"I'm sorry. I should have explained earlier. I'm too engrossed in our fight I wasn't aware that I have gone past my original duration," Spark said. Jack somehow found this statement hard to believe. Because of Spark's appearance, he saw the automaton as an emotionless machine. Perhaps this was a wrong perception.