In my oppinion is not worth reduce the days, basically would be an exploit to get FREE money.
would be 1 nature reroll each 2 days, so if you use 4 accounts would be 4 nature rerolls each 2 days basically 1,2M each 2 days.
If a month have 30 days would be 15 nature reroll tickets each account: 15 X 4 = 60 nature rerolls = 30 Rerrolls, each reroll cost 650/700k so would be 650K X 30 = 19.500.000 pokedollars per month, to be a MMO i think is TOO MUCH money, so for me would be a -1.
And dont come like: is very hard to beat that boss bla bla bla... Because some users already know a strategy to beat that boss and get the 40 wins in 30/40 minutes. So for me is a no.