You get 45 minutes, sometimes more if the interviewers can see that you’re close.
These days Google offers the option of a chromebook instead of a whiteboard.
This definitely isn't advertised, I interviewed there on Friday for frontend and was presented with an entire wall to write on.
Would have preferred the Chromebook, could have done a final test run of the code, written out params and comments, tests, etc.
thanks for explaining how coding interviews work to me thou, really had no idea based on the 200 i've administered in recent years or dozens taken in my career.