Not possible because their $500k/year likely only materializes after vesting. Leaving after only 3-4 years on the job would mean the realized yearly comp is closer to 200-250k.
For the standard 4-year vesting schedule, and assuming a new $350k grant every year, this means actual earnings are:
Year 1: $150k + $0 $150k
Year 2: $150k + $87.5k $237.5k
Year 3: $150k + $87.5k*2 $325k
Year 4: $150k + $87.5k*3 $412k
Only by year 5 you'll finally actually earn the $500k/year, and the vesting schedule has such an impact on the early earnings that even after a decade, your yearly average is still $400k.
Not to forget taxes. So the idea to "save for one year then take 6 years off" is kinda off the menu unless they've been at the company for a long, long time, or are willing to spend those 6 years living in Thailand.