Depends on how long it takes for the incoming instances to initialize and outgoing instances to fully decommission. x = time it takes to switchover y = length

Depends on how long it takes for the incoming instances to initialize and outgoing instances to fully decommission. x = time it takes to switchover y = length of the cycles x/y = % increase in cost For us, it's 15 minutes / 120 minutes = 12.5% increase, which was deemed acceptable enough for a small service.