Can I start a subflow and leave it running after the parent flow ends? Basically I have a job that has a component that needs to be done sequentially (but only takes 15 seconds) but that sequential component can trigger another component that can be done concurrently (but will take 45 seconds).

https://github.com/PrefectHQ/prefect/blob/main/src/prefect/deployments.py#LL47C20-L47C20 Unsure if this solves ur case. But if the subflows are deployed, then with 0 timeout you could possibly check the result which will not be COMPLETED and just continue on with the main flow while the triggered flow continues.

I don’t think deployments are the right answer for me. I’m trying to use this pattern here because I need the flows to run in realtime: https://medium.com/the-prefect-blog/serverless-real-time-data-pipelines-on-aws-with-prefect-ecs-and-github-actions-1737c80da3f5