The final required attribute is duration, which specifies the time for this animation step in milliseconds.

最后一个必需的属性是duration，该属性指定动画所经历的时间，以毫秒计。

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Step 4: Estimating the Duration of Each of the activities.

第四步：估量每个计划活动项目所需要的时间。

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Using this model and the Recursive Least Square (RLS) method, the model parameters and then the mass to be weighed can he identified from the step response of very short duration.

借助这一模型和递推最小二乘法(RLS)，可以由极短的称重阶跃响应估计出模型参数和被称质量。

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But Morningstar and other research firms caution that anyone planning to hang on to Facebook for a longer duration might want to step back from that frenzy and give the deal some thought.

WSJ: IPO Analysts Warn of Longer-Term Facebook Risks

As a first step, it has acknowledged that the optimism bias causes individuals to underestimate the cost and duration of projects.

CNN: Why we fool ourselves into optimism