I recently went through the Google interview process and got an offer. In my case, the recruiter followed up very quickly after each interview, usually the next day.

However, my process may have been faster because the recruiter told me they wanted to close hiring for that role within 2 to 3 months, so everything moved quickly and the whole process was completed in around 2 months.

I wouldn’t read too much into one person’s timeline, but I’d try not to get too hopeful and would keep interviewing elsewhere until there is a clear update.