Understanding the 10-day rule is crucial for TN visa holders entering or leaving the U.S. This rule permits entry up to 10 days before your job starts and allows you to remain in the country for up to 10 days after employment ends. However, these periods are strictly for personal preparations, and working during these times is prohibited. Remember, the post-employment grace period is at the discretion of DHS, so always check your I-94 record to verify your authorized stay. For personalized advice, consult with an immigration expert.