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Explanation: This is precisely the proper term, calque or not. It's a standard phrase in all technical areas, and has been adopted by the world's patent offices and attorneys.
Regardless of the specific nature of the bid proposal that is the subject of the query, something along the lines of the following English text should do: "... how much time the Supplier requires to prepare its bid. This time period should be consistent with the complexity of the request,* and should reflect the state of the art in the field."
*NOTE re "request": The full phrase in English is "Request for Proposal" (abbreviated and referred to universally among contractors as "RPF").