Is a contract valid if acceptance (Qabul) follows the offer (Ijab) after a delay?

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The contract remains valid provided both parties remain in the same session (Majlis) and do not become preoccupied with matters other than the contract. The ruling of the session is considered the ruling of the time of the contract itself. This is evidenced by the rule concerning immediate possession (Qabd) in contracts where it is stipulated, and by the establishment of the option to revoke (Khiyar) in exchange contracts (Uqud al-Mu'awadat). If the parties separate before acceptance, the offer becomes void because its meaning is lost, as separation implies refusal (I'rad) from the offeror's side, thus precluding acceptance.