Flowing the Opened Email Response

I have a campaign node that sends an email which then connects to two outcomes. The transition lines have a short delay and then one has "email clicked" ticked and one has "email opened".

I am finding that my audience will go down the path of email clicked if they click on the link, but anyone who just opens the email without clicking remains participating in the email stage and does not progress down the "email opened" path.

My question is, is there a default delay in determining if a user did not click a link? For instance, will the campaign wait for a day before assuming that user is not going to click and move them down the path? Or do I need to refine my criteria?