为什么我视频全部学完了，还是显示学习时长为0？

<p>我的显示的也很少，不知道原因。</p>

<p>我也是，课程快听完了，学习时间才16个</p>

<p>我到现在还都是0，不知道怎么回事啊？</p>

<p>前几天还有3个多小时，听了三天课，现在变成0了，很是奇怪。<br ></p>

<p>我的学习时长从之前十八小时到现在的2个小时是什么原因？？？</p>

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