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Liquidation on Arcus is determined by Margin Ratio which uses the Mark Price to calculate. When an account’s Margin Ratio reaches 100%, its equity has fallen to its maintenance requirement and liquidation occurs. Below 100%, positions remain open regardless of what the account’s buying power looks like. Two inputs sit behind that number. Maintenance margin, shown in dollars on the account panel, is the collateral required to keep current positions open. Account equity is what stands against it. Margin Ratio rises when equity falls or when positions grow, and only then. Neither input carries the off-hours surcharge: the 50% increase applies to initial margin, which governs opening positions, not keeping them. Adequately margined positions are not pushed toward liquidation simply because the underlying market is closed. Crypto perps have no off-hours regime at all; their margin requirements are the same at every hour. Read together, the off-hours design is deliberately conservative about new risk during thinner liquidity while leaving existing positions untouched. Margin Ratio, and the distance between mark price and liquidation price on each position, are the numbers that describe safety, and neither is affected by the transition into or out of regular trading hours.