43 C.F.R. § 3.6
Time limit of permits granted
No permit will be granted for a period of more than 3 years, but if the work has been diligently prosecuted under the permit, the time may be extended for proper cause upon application.
No permit will be granted for a period of more than 3 years, but if the work has been diligently prosecuted under the permit, the time may be extended for proper cause upon application.