WEM Analytics 422 error on legal hold date range

Could someone clarify why the /api/v2/analytics/wem/data endpoint returns a 422 Unprocessable Entity when querying digital channel interactions for a legal hold period spanning three months? The request payload is valid for shorter ranges, but fails specifically when the start and end parameters exceed 90 days.

{
 "code": "bad_request",
 "message": "The requested time range exceeds the maximum allowed duration for this query type."
}

This blocks our bulk export job for the current discovery case. Is this a hard limit for digital channels only?