I turn on the bkender for about two minutes.(对for about two minutes提问)

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I turn on the bkender for about two minutes.(对for about two minutes提问)
I turn on the bkender for about two minutes.(对for about two minutes提问)

I turn on the bkender for about two minutes.(对for about two minutes提问)
How long do you turn on the blender?

答案本身有问题,应该说I have been turning/ have turned on the [bkender???] for about two mintutes。
问题应是:How long have you been turning/ have you turned on the [bkender]?