Official policy (when I was there) is 18 month minimum before you can transfer. There can be exceptions, but they are exceptions.
About 3 months in, I talked to my manager about transferring off a project I disliked. His response a month later, which I believe came from the site director, was literally "We don't care."
Which is fine, I just think it's important to know that Google is not generally flexible about initial allocation, and you will generally be expected to stay on your first project for 1.5 years--regardless of how you feel about it. And you may not know what your first project will be until after you're hired, or even after orientation.
About 3 months in, I talked to my manager about transferring off a project I disliked. His response a month later, which I believe came from the site director, was literally "We don't care."
Which is fine, I just think it's important to know that Google is not generally flexible about initial allocation, and you will generally be expected to stay on your first project for 1.5 years--regardless of how you feel about it. And you may not know what your first project will be until after you're hired, or even after orientation.