I have 2 column as below and I want to calculate the average number of days
ABC occurs.. In this case it should be 3.33

Col A Col B
01-Apr ABC
01-Apr DBA
01-Apr ABC
03-Apr GRT
05-Apr HTA
05-Apr JYU
08-Apr ABC
08-Apr GRT
08-Apr HTA
10-Apr JYU
11-Apr ABC