The heart of this question is inspection and acceptance terms and the answer is contingent on the terms and conditions of the contract, especially the inspection and acceptance clause(s). For example, paragraph c in FAR clause 52.246-2 Inspection of Supplies-Fixed Price says that the Government has the right to inspect and test all supplies in any event. This paragraph goes on to say that the Government will not unduly delay the work. Review the applicable inspection and acceptance clause(s) in the contract (and any other terms that affect acceptance), and they will provide the answer.