Lets' say the margin requirement for the futures i am trading is $50 (something like the MES).
I put $50 into the account, and buy 1 contract, and in an hour or so my position is sitting at a $150 loss.
I imagine my account would be sitting at -$100 now ($150 loss minus the $50 cash i put in).
Will the brokerage be asking me to deposit another $100 now?
How much time(i know it differs from brokerage to brokerage) will I have?