EndoTarget, well your broker isn't in a hurry when he triggers a margin call :)
I only had one in my live, by a mistake on my behalf, and I had 48H to solve it myself before the Prime Broker would solve it with the Executive Broker and just sell whatever they saw fit.
And I think that 48H was a lot of leeway thanks to an otherwise perfect account situation.
By the way: We needed to break through 12,96$ to start the beginning of elasticity :)
AIMO