The runtime is the upgrade runtime which is minimized using the resource-minimized mode where only one instance is up (either the actual instance or the shadow instance) at any particular time. This ensures that the shadow instance can use all the available resources on the system. This increases the downtime of the system which means the system cannot be used productively by the users.
On the other hand , downtime minimized mode increases the over all runtime of the upgrade , but the downtime of the system decreases and the users can productively use the system for a longer duration compared to the previous case. In this case both the instances (main and shadow) run in parallel and the hardware resources in the system are shared by both the instances
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