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> **Possible Duplicate:**  
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> [How long is “a few seconds” for Kill Skills?](https://gaming.stackexchange.com/questions/86019/how-long-is-a-few-seconds-for-kill-skills) 
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The Assassin/Zero/Zer0's "Killer" skill:

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> Kill Skill. Killing an enemy gives you bonus Critical Hit Damage and Reload Speed for a few seconds.
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How does the "Killer" skill work? How long is a few seconds here? Does the effect stack or just renew?