RD CALS Grace Period

We have 2016 RD Cals Server on User Licensing. If this server goes down, is there a grace period we are offered?

and

If the RD Cals licensing server goes down, will the new user who doesn't have a license assigned still be able to login? Like in terminal server scenario or Citrix Servers

Also if the user has license assigned, will they still be able to login if the license server is still down?