At Google, RSUs are subject to a 4-year vesting schedule: 25% vests in each year (2.08% every month). Alternatively, Google also has the following 4-year vesting schedule: 40% vests in the 1st year (3.33% every month), 28% in the 2nd year (2.33% every month), 20% in the 3rd year (1.67% every month), 12% in the 4th year (1% every month).

Google commonly refers to RSU as GSU (Google Stock Unit). Although the name is different, it is the same as RSU's. Google's Vesting Schedule may vary between monthly and quarterly vesting depending on the number of shares you recieve: less than 32 GSUs (Annually), 32 - 63 GSUs (Semi-annually), 64 - 159 GSUs (Quarterly) and 160+ GSUs (Monthly).