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Have you tried to set the Interval Type to Hourly and Interval Value to 5 (the time between 7:30AM and 1:30PM). And then Intraday Start at 7:30AM and Intraday End to 2:00PM. The last value should be at least 1:30PM, but I am not sure if it will still start, and should not be later than 1:30PM + 5 hours to prevent a third start.
The documentation is indeed not very clear on these cases.
WebFocus 8206M, iWay DataMigrator, Windows, DB2 Windows V10.5, MS SQL Server, Azure SQL, Hyperstage, ReportCaster