Like all systems, Cal Poly's Drupal environments occasionally requires maintenance that causes downtime.
If/when such maintenance is needed, our standard window is 1:30am-2:30am (PST) on Thursdays.*
This is a timeframe during which the system usage is very low, minimizing the impact of the downtime. Doing this on Thursday also means the following day is during the normal work week, which makes it easier for our staff to quickly and efficiently follow-up should any issues arise during the maintenance.
*Maintenance is not performed every Thursday, but we aim for that window when maintenance is required. As such, it is always a possibility that Drupal sites will experience service interruptions at that time.