How To Write A Letter To Extend Notice Period . Length of the lease extension, including the proposed end date. I am aware that the standard notice period for employees is of 30 days. 27+ Notice Period Letter Templates Free PDF, Word Formats from www.creativetemplate.net The previous notice period of [enter number of days] has been changed to [enter number of days]. Respected sir, it is stated with due reverence that i am the student of this estimable university. I am extending your notice period because we can’t find any good substitute employee for your position that will be vacant when you leave.