EPIC (or other EMR) downtime at your institution?

My hospital system uses EPIC. We have monthly downtimes for system updates, maintenance, etc. This always occurs on a weekend night, which is understandable from a system perspective, but maddening from my perspective, because the ED is one of the few departments maintaining a daytime pace. How often do your systems go down, and for how long? Do any of you have EPIC and not have regular downtimes?