When you get your offer letter which depends on country laws it will tell you how many shares you will get and also the annual bonus.
Shares were based on your job title / job band and not related to your annual salary.
I received 600 shares which was extremely generous as I am non management position but at the same band as a manager. I will also receive 20% annual bonus that could payout between 75% to 150% depending upon division and corporate goals reached. Payouts in past years have been extremely generous reaching 150% of corporate goals.
I received my offer letter last December and my shares started to distribute quarterly since June of this year. Shares are distributed before the divided payouts for that quarter which is nice. As you are given a block of 4 years worth of shares the last bit will distribute at 7 years. After 4 years Hock Tan mentioned he will find another way to reward employees.