Can you tell me about Certain's scheduled maintenance windows and how often they occur?

Certain’s regular scheduled maintenance window is from 9:00 PM to 11:59 PM Pacific Standard Time, and it can total up to 3 hours per month. Certain Product Support

Scheduled maintenance requires at least 14 days’ notice, and Certain may change the maintenance window with one week’s prior notice. Non-routine maintenance also requires customer notification. Certain Product Support