The minimum number of trading days needed for the challenges at FundedNext depends on the specific challenges.

For Evaluation, Stellar Lite, and Stellar 2-Step Challenge accounts, the minimum trading day requirement is 5 trading days, and for Stellar 1-Step Challenge accounts, the minimum trading day requirement is 2 trading days.

However, it's important to note that there is no minimum trading day requirement in the Evaluation, Stellar Lite, Stellar 1-Step, and Stellar 2-Step FundedNext accounts. 
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On the other hand, for the Express account, the minimum trading day requirement is 10 trading days. Traders are expected to actively trade for a minimum of 10 trading days in the Express account. This minimum trading day requirement is applicable for both the Challenge account and the FundedNext account.