Are there any consistency rules for days traded and/or profit per day?

Yes, there is a consistency rule, but it only applies to funded accounts, not during the challenge phase.
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For 1-Step funded accounts, no single trading day can account for more than 40% of your total profits at the time of payout.
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For 2-Step funded accounts, there is no consistency rule.
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For FastTrack funded accounts, the limit is 20% per day.
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This is designed to ensure consistent performance over time rather than relying on a single large trading day.