In what kind of timeframe would there be interplanetary trade?

I have two binary planets, with technological level of about the present day. They've developed communication between the two planets, and scientists are trying to develop a method of getting people and materials there, and exchanging the materials for other things. With both planets communicating, in what kind of timeframe could I expect viable (for very large companies, like apple size,) interplanetary trade?

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In what kind of timeframe would there be interplanetary trade?

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