Time Limitations For Sign-Up. 1. Vacation sign-up will be by seniority and commence on the 1st of December. Each employee will be notified by the union of the date for signup at least one week prior to the beginning of the signup period. The employee shall be responsible for predetermining the vacation period(s) desired. Recognizing that there may be times when an employee will not be ready to make his/her selection upon request, said employee shall be given forty-eight (48) hours to decide. Should that selection not be made within this time frame, such employee will be bypassed. Bypassed employee(s) shall be allowed to sign in available periods after employees who have been notified it is their turn to sign, but junior employees who have signed shall not be required to relinquish the periods they have selected. Vacation signups to be completed by the start of the annual leave year.