Final answer:
The duration of a completed license application form serving as an interim license varies by regulation and license type, and it's used while the formal processing is completed. The specific timeframe depends on local licensing authority guidelines.
Step-by-step explanation:
The length of time that a completed license application form may serve as an interim license can vary depending on the state or country's regulations and the specific type of license being applied for. Generally, an interim license is provided to allow the applicant to legally operate under the license while the formal processing is being completed. The interim license typically has an expiration date, which again varies. It's important to check with the relevant licensing authority to understand the specific timeframe for the interim license in your area.