Here is the revised index displaying user freshness values and their corresponding time since subscription:
0 = Unknown
1 = 0-1 hour
2 = 1-2 hours
3 = 2-6 hours
4 = 6-12 hours
5 = 12 hours - 1 day
6 = 1-2 days
7 = 2-7 days
8 = 7-14 days
9 = 14-21 days
10 = 21-30 days
11 = 30-45 days
12 = 45-60 days
13 = More than 60 days