In order to log this cache, you must have found at least 275 different geocaches, on 55 different days, in 10 different combinations on those days, that were placed in different years.
On 1 day, at least 11 caches placed in 11 different years
On 2 days, at least 10 caches placed in 10 different years
On 3 days, at least 9 caches placed in 9 different years
On 4 days, at least 8 caches placed in 8 different years
On 5 days, at least 7 caches placed in 7 different years
On 6 days, at least 6 caches placed in 6 different years
On 7 days, at least 5 caches placed in 5 different years
On 8 days, at least 4 caches placed in 4 different years
On 9 days, at least 3 caches placed in 3 different years
On 10 days, at least 2 caches placed in 2 different years
1. You may used cache that you found since you started geocaching.
2. You can sign the log at anytime, just post a note that you did, then log it online when you complete it.
3. Please show proof. You will have 7 days to show proof before I delet the log. There is a GSAK Macro (11X11-year-challenge macro)