Once you execute a script deployment, is it possible to cancel or do you have to wait for it to run its course?

I have had to do that with scripts when the update is a large quantity of records. You can try to undeploy the script to the record. Sometimes a heavy measure is to delete the script entirely. Not the script in the File Cabinet, just the script record. That definitely works.

You can mark inactive or throw a bug in the code, but it will still take time to fault.

Appreciate the responses, little surprised there isn't a stop function.