For aging of IMD, what business day calendar is being used?

The aging of an Intraday Margin Deficit (IMD) is calculated using the U.S. Trade Calendar, which defines business days based on U.S. market trading sessions and excludes weekends and market holidays

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What trading restrictions are imposed on my account for 90 calendar days after failing to satisfy an Intraday Margin Deficits (IMD)?
What happens if I do not satisfy an Intraday Margin Deficit (IMD)?
Can my account receive credit for a pending deposit if my account is subject to the 90-day restriction?
What happens if my account incurs an IMD over the weekend or on a US trading holiday?