I started on a H-1 right after school (where I was on an F-1) and my GC was filed within the first month of my joining msft. But you're right, people on F-1 ca

I started on a H-1 right after school (where I was on an F-1) and my GC was filed within the first month of my joining msft. But you're right, people on F-1 can stay on something called OPT for 2 yrs after graduating whilst working. But my employer decided against that because not only is it a pain in the ass to work with that, there's no guarantee that you'll have enough H-1s left 2 yrs down the road.