The TopTier Challenge Plus accounts have a minimum and no maximum sim trading day rule. In order to pass the challenge, you need to meet the minimum sim trading days within the maximum sim trading days.
Minimum Sim Trading Days
Tier 1 has a minimum of 4 sim trading days
Tier 2 has a minimum of 4 sim trading days
Maximum Sim Trading Days
Tier 1 has unlimited sim trading days
Tier 2 has unlimited sim trading days