The good news is that we've made a lot of the mistakes already and we've learned some lessons (see this technical rant, this post-mortem or this experiment).
好消息是我们已经犯了很多错，而且已经得到了很多经验教训(参阅technical rant、post - mortem或experiment)。
It should take around 2-3 hours. For details see our Technical News.
预计花费两到三个小时，详细信息请看技术新闻。
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