Currently:
30 day minimum (1.2% annually) and 90 day max (1.5% annually)
PoSP (launching shortly):
1 hour minimum, no maximum
2% annual interest minimum which scales up reflective of how many CBX are actively staking every minute. i.e. if 1/10th of the CBX in existence are staking at a given time (100,000 of the approximately 1 million), those 100,000 would earn 10 times the standard yearly pos (their 2% plus the 2% from each coin not being staked) = 20%. So inflation will remain static at 2% per year.
So that's what all the excitement for this PoSP and Crypto Bullion is all about... wow I did not quite understand it - these numbers are very exciting!