– Start of Last Update specifies the time (in minutes) from the beginning of the previous update to the start of the next update.
The current update must complete before the next one can start.
If the update is still in process when the time period expires, the next update will start immediately once the current update completes.
– End of Last Update specifies the time (in minutes) from the end of the previous update to the next update. A value of 0 causes updates to occur as fast as possible.