Sorry to insist but Imm. said "no more than 2 periods" of 90d. Logical. No more than 6months.
I did it myself recently, however before the new rules came up.
*****
to
*****
with extension, then I went to Vietnam 3d and come back, had until
*****
with extension.
Some people did this
***
/5 times, but now it will be impossible