This requirement is only for funded stage.
The Consistency Rule limits how much of your total Payout Cycle profit can come from a single trading day. On 1-Step Challenge accounts, the limit is 40%, and it applies only at the Funded stage.
Example: if your total profit for the cycle is $2,000, no single day can contribute more than $800 (40%). The rest needs to come from other profitable days. This is checked when you request a Payout; if it is not met yet, you simply keep trading until it is.