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MicrosoftHi Joby_Jennings, all engine instances for a given load test run are created and configured in parallel. You wouldn't need to increase the test duration based on the number of engines, the test duration timer will be started only after all engines have started the test run.
Your JMeter script executes within the context of a single engine. So the ramp-up schedule is replicated for each engine.
To keep the overall ramp-up schedule the same, you'd need to factor in the number of VUsers that are being ramped up in accordance with the number of engines. You may also parameterize this field in the JMeter script to read from environment variables, so you wouldn't need to re-upload the script every time you need to change the number of engines and keep the ramp-up schedule the same.
You can find more information about parameterizing JMeter script here - Parameterize load tests with secrets and environment variables - Azure Load Testing | Microsoft Learn