If you insert 12,000 records with this trigger enabled, the trigger would execute on each record, generate a random number, set the Account Number field, and then save the record. This could take some time to complete, especially if there are other triggers or processes running on the Account object. The amount of time it would take to complete depends on the resources available in your Salesforce org, such as CPU speed and available memory, as well as the number of other processes running at the same time.

Additionally, if there are any validation rules or workflows that run on the Account object, they may also affect the performance of the trigger. It's important to test your trigger thoroughly before deploying it to a production environment to ensure that it performs within acceptable limits and does not negatively impact other processes.
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