I have an automation that updates multiple fields (say, 10 for the maths) whenever an issue is updated. It also transitions the issue to a new status if that status changed.

https://support.atlassian.com/cloud-automation/docs/how-is-my-usage-calculated/ This says that "usage is measured by the number of rules that execute each month". Then it goes on to say "Any time an event fires as a result of an automation rule you have enabled, it will count as a rule execution."
So if a single issue is changed and triggers the automation, is the usage:
1 because it was one rule triggered
11 because it checked/ updated 10 fields and the status transition?
Would it be better to have the trigger be a set time during the day and update all issues in one batch?