How lab reduction time works.

As attached are the picture of 2 different town with assigned hero.

As you can see the research time only influenced by only one of the town not 2 total assigned hero.

So, just start your research at the highest reduction time town.

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Wow, just notice the different. Thanks.

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fyi, chengyu is the best lab hero
make him lv 80
and given high intelligence boost legacies