Disclaimer:
This cache is not for everybody; It is only only for those who are truly insanely addicted, like me! 
This is a crazy step up based off my cache: 10 years in a single day Challenge Cache - GC458G4
In order to complete this challenge and log the final 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.
You must have found the following combinations:
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.
• You can only use each day for 1 combination.
• You can use any cache type, including events.
• No Double Logged "FOUND" caches allowed; Your log on each Geocache must be from the very first time you Logged "FOUND" on that Geocache.
• Once you have found the required caches to qualify for this challenge, you may then find the physical cache and sign the log, and then log your find online.
Verification Method:
When you log this cache you must include in your log which days you found each set of combinations.
Here is an "OPTIONAL" GSAK Macro that was written for this challenge. GSAK Macro
Use it against your FOUND caches.
NOTE: You are not required to use this macro to list out your results, but it does make it easier.
Your log should look similar in format to this:
These are the dates I have met the requirements:
01 x 11 years in a day:
10/15/11
02 x 10 years in a day:
05/29/11, 01/26/13
03 x 09 years in a day:
03/26/11, 05/14/11, 04/03/12
04 x 08 years in a day:
01/26/11, 02/26/11, 03/05/11, 03/13/11
05 x 07 years in a day:
03/20/10, 07/11/10, 10/17/10, 10/29/10, 11/28/10
06 x 06 years in a day:
01/30/10, 02/15/10, 05/13/10, 05/15/10, 05/21/10, 06/06/10
07 x 05 years in a day:
12/22/09, 01/09/10, 03/23/10, 03/28/10, 05/01/10, 05/08/10, 05/11/10
08 x 04 years in a day:
12/21/09, 01/10/10, 01/16/10, 01/18/10, 01/23/10, 01/28/10, 02/05/10, 02/20/10
09 x 03 years in a day:
12/18/09, 12/20/09, 01/03/10, 01/17/10, 01/21/10, 01/22/10, 02/03/10, 02/06/10, 02/7/10
10 x 02 years in a day:
12/19/09, 01/24/10, 01/31/10, 02/01/10, 02/02/10, 02/26/10, 03/10/10, 03/15/10, 03/18/10, 03/21/10
Best of luck!
*NOTE*: The dates listed above are the dates I met this challenge's requirement.