Authentication key query

Hi Team,

Kindly request you to provide the information on below point

1: Can we use single Authentication key to fetch/pull the multiple Assets in streaming API’s.
eg .
Auth key use for Compnay register = abcd-abcd-abcd-abcd:
can we re use for Filing_history abcd-abcd-abcd-abcd:
2: Is there any time limit / scheduler/job to pull the records using streaming API.