you must be from earth? considering the concept of batch exploring.
Mr. Pres would know but many people rarely explore unless its to regain readiness
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my opinion is your better off expanding and building 1 turn at a time if your going to expand and build. this is lengthy and time consuming, but it keeps your production %'s high. (production is based on what % your land is built towards 1 strat / your total land) so expanding until 50% if it is unbuilt hurts your production on each consecutive turn.