Can someone please clarify the 1.5% APR and how it applies to staking?

At the same time, holders of GRC who do not maintain a magnitude are given their 1.5% APR regardless of whether or not they maintain on online balance.

Does this mean everyone who holds GRC in a wallet will get 1.5% interest even if they don't keep the wallet online? And when is the 1.5% interest paid?

Or is staking a requirement to get the 1.5% interest?

How is the 1.5% interest paid out (stake reward)? For example let's say I have 2000 GRC in my wallet today and it takes 12 days to stake would I get 20000 GRC *.015 (interest rate)/365 (years in a day) *12 (days to stake) = 0.98GRC as my reward or interest?

So under the current system if a whale that stake multiple times a day they are only getting 1.5% interest based on the last time they staked? Can someone please explain how the stake rewards works if a whale stakes multiple times a day?

My understanding with the new CBR every time someone stakes their will be a certain amount of GRC (not based on wallet balance) . But the wallet balance will determine how often you stake?
Sorry for the noob questions but I seem to be getting conflicting information form different sources.