I created some emails to be sent right away and other to be sent after

I created some emails to be sent right away and other to be sent after few days after the submission. But then the choice is from 7 days to 14 days after, is there a way to choose in the middle? i can't choose a date because the submission is different for each person

You can select an in between dates by choosing a custom date. Use the option on a later date.

Example:

Let us know if you are not able to do it similarly.