Thanks @todd.hoffman abacon @apjvinod for your feedback.
start_at on the X axis, and count of event_id on the Y axis won’t solve it.
The question is a bit more complicated than that, here is how it can be done using Tableau (just as reference) if someone can help translate or find an equivalent approach using Quick Sight.
Link: https://kb.tableau.com/articles/howto/showing-records-that-fall-within-a-period-of-time
Thanks for your help, much appreciated!