Jeff bir iş bulmadan önce üç ay boyunca kaldırımları arşınlamak zorunda kalmıştı. - Jeff had to pound the pavement for three months before he found a job.
Geçen yıl üç ay boyunca denizdeydi. - Last year, he was at sea for three months.
The period of duration from the same date of one month to the same date of the next month, and thus can be 28, 29 during a leap year, 30 or 31 days long. For example the duration from 21st January to 20th February