Does anyone know how fast motivation goes down?

My wonder Crobat, who is alone in a village gym, lost 1915-1830 = 85 CP in exactly 4 hours.... -21.25 CP per hour. The loss rate seems steady at -1.11% per hour.

My near 3100+ Blissey dropped like 100 in less than 30 minutes I think...it drops a TON initially I feel...then seems to slow down...or maybe Blisseys just drop faster...

Will wait for smarter people to figure it out and share. :)