As per the doc Known issues in Customer Insights - Journeys with mitigations - Dynamics 365 Customer Insights | Microsoft Learn on Microsoft Learn, a single wait tile in a journey cannot extend beyond 90 days. However, the customer would like the option to increase this wait duration, as certain contacts—such as university students enrolled in a 3-year degree program—need to remain in the wait tile for extended periods to support longer-term journeys.