The maximum value is 256 if the mining structure is stored in an instance of Analysis Services.
As you increase the number of folds, the time that is required to perform cross-validation similarly increases by n.
You might experience performance issues if the number of cases is large and the value of Fold Count is also large.
Max Cases Specify the maximum number of cases to use for cross-validation.
The maximum value is 10 for session mining structures.For more information, see Cross-Validation (Analysis Services - Data Mining).Cross-validation cannot be used with models that were built by using the Microsoft Time Series algorithm or the Microsoft Sequence Clustering algorithm.Analysis Services then generates a set of standard accuracy metrics for each model.By comparing the metrics for the models generated for each cross-section, you can get a good idea of how reliable the mining model is for the whole data set.
The number of cases in any particular fold is equal to the Max Cases value divided by the Fold Count value.