In PowerPlay, merits stay valid for 4 weeks but decay every week. The following example shows the merit values over a 2 week period. Example values have been added to 'This week' then 'Next week' shows what happens to these values.
This week's merits = 5000
Previous weeks = 2300
Two weeks ago = 1000
Three weeks ago = 700
Current total merits: 9,000 (5000 earned this week, 4000 carried over)
At the end of each week (Thursday morning GMT on our servers) the merit values are halved and shifted to the next week until it reaches week 5, at which point they are removed.
This week merits = 0 (So far)
Previous weeks = 2500 (5000/2)
Two weeks ago = 1150 (2300/2)
Three weeks ago = 500 (1000/2)
The previous week 4's 700 merits have been completely removed. All other Merits were halved.
|Merits||Week 1||Week 2||Week 3||Week 4||Week 5||Week 6|
|Current Merits earned:||1000||800||4000||2400||3000||1500|
|Previous week||0||1000/2 = 500||800/2 = 400||4000/2 = 2000||2400/2 = 1200||3000/2 = 1500|
|Two weeks ago||0||0||500/2 = 250||400/2 = 200||2000/2 = 1000||1200/2 = 600|
|Three weeks ago||0||0||0||250/2 = 125||200/2 = 100||1000/2 = 500|
|Four weeks ago||0||0||0||0||0||0|
|Total for each week||1000||1300||4650||4725||5300||4100|
We hope this helps to explain both how merits decay every week and when they are no longer considered in your merit total. For a further explanation from our developers please read this forum post.
Attached you will find a table (in Excel and png formats) that illustrates merit decay.
If you have any further questions regarding this calculation, you can send us a ticket using the button below.