1 Key = How many locks? Any Limits?

Question for having a SINGLE KEY=
How many locks can a single key be used for ? Unlimited?
When making a CLONE KEY = if you had the MASTER KEY only assigned to 1 lock, created the clone, then used master on a different locks that didnt have a key assigned = would the clone auto unlock the new locks?
How many locks can a single key be used for ? Unlimited?
When making a CLONE KEY = if you had the MASTER KEY only assigned to 1 lock, created the clone, then used master on a different locks that didnt have a key assigned = would the clone auto unlock the new locks?