The MAX function can be used on any fields supporting aggregation which have a numeric type:
- Integer (Int32/Int64)
It will return the maximum value across all the values in the query (or the set of values being evaluated for the current Facet or Group).
The MAX function, like the AVG, MIN and SUM functions, takes a single argument, which is the name of the field it should calculate over.
This would return the date/time of the most recent update to a script across all projects.