Ok, since there's no topic on the forums for this one, let's talk about it.
The initial impression is, well, considerably less time than the 72 obviously, but I've found myself getting a lot of coins for the tasks than I would normally get from the 72 hours challenge, here's a break down of what I've seen so far:
for a level 110:
Collecting food (BLR) is giving me a return of over 1K coins each rotation, guardian active, instead of the around 600 I would normally get.
PVP is giving 240 coins instead of the normal 80 (I think)
Breeding is giving between 5 to 11 coins each breed.