Your average is calculated every hour for up to a maximum of 12 6 months or whatever time frame we have data for (the system has not been in place for 12 months yet so it is just based on the data we have so far) by summing your seeding total for each hour and dividing it by the number of hours your account has been active (or whatever we have data for).
In addition to this, any torrents uploaded by you that you are no longer seeded by you but others have kept alive are assigned a bonus and added to your seeding average. This reflects the value we place upon members who are and have been very active uploaders.
Example time! I'll use some of the data you provided to help explain how the system works.
Assume your account is three months old, for two of those months you were incredibly active and managed to maintain exactly 1 TB (1024 GB) seeding every hour but in the third month you had to go back to school and couldn't afford to keep that amount of data seeding and your average was 40 GB every hour.
To understand what your overall average would be you simply need to calculate (I hope more mathematically gifted members can forgive me, I am about to mangle numbers here):
seeding total for each hour your account has been active summed together
/ number of hours your account has been alive (or what we have data for)
With the data we have and just using 30 day months we can calculate:
1,474,560 (1024 * 1440) + 28,800 (40 * 720) = 1,503,360
/ 2160
------------------
= 696 GB average seeding size.
If you had uploaded a torrent within that time and it was no longer seeded by you but still alive (seeded by others), TC would assign a bonus and add it to this average before it calculated which member class you would be. You can see this (along with all the others) figure in your profile.
Obviously, this is a very simplistic example and the system TC uses takes in to account things like months with more or less than thirty days as well as handling the fact that seeding size can change wildly from hour to hour (not everyone can seed 24/7, etc...).
I hope this answers your question and it is easy to understand.
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