Answer:
70 to 75 years
Step-by-step explanation:
In 25th of Jan. 1915, the letter was received by Connie but the letter was been written by Jim in 1914. The letter must have been kept for like
(70 to 75 years) by Connie which is a very long time. Since she informed the narrator that she do read the letter that is been found in junk shop from time to time and have the feelings that Jim is not in far place from her