I was given 5 minutes to ask questions after each round of interview. That part was ordinary too. That's what most of the other companies do (FAANG or otherwise).
When I was interviewing for an SRE position with Google in Dublin, I had about 10min to ask questions in each of the 5 interviews that were conducted on-site.
In between the interviews, a sixth SRE would take me to lunch for about an hour. Anything discussed with him wouldn't be evaluated as part of the interview.
So there was plenty of time for questions, I would say.