querying recipients of a particular delivery in the past 24 hours
Hello, I'm trying to create a query that will look at the event date of a recipient who received a Welcome Email but did not open it in the last 24 hours. For example on 8/14 I want to send another email to recipients who were sent the first email on 8/13 but did not open it. I'm having a problem with calculating the event date. If I hardcode the date I can get it to work. but when I use 'current date minus n days' the query just spins and doesn't produce a result.

any ideas?
Thank you!