Trademark registration can last for unlimited consecutive 10 year periods provided that timely post registration maintenance and renewals are met. The Declaration of Use (continued use in commerce/excusable nonuse) must be filed between the 5th and 6th year following registration and the combined Declaration of Use/Excusable Nonuse and Application for Renewal must be filed between the 9th and 10th year after registration and every 10 years thereafter. Failure to file these documents results in cancellation/loss of the registered trademark. (e.g. Trademark date of registration: January 1, 2020, due date for 1st maintenance document: January 1, 2026, due date for 2nd maintenance document: January 1, 2030, due date for 3rd maintenance document: January 1, 2040, …). If a deadline is missed, a 6 months grace period is available with a late fee.