Is there a calculator available or calculating my staking rewards?
What staking/batching frequency is the most efficient one?
Staking every 90 days?
Yes there is calculator on website. If you have lets say 1000 ACC then stacking it every 3rd is worth it. Otherwise once every 90th day or bit before to not miss deadline. Because clock will reset after 90 days.
Clock doesn't reset at 90 days
Clock stays the same at 90 days.... If you stake at 100 days you would get the same reward as if you staked at 90 days.....