Allowing duplicate submission after 24 hours

I have successfully implemented the is_already_submitted validation to prevent duplicates and this this is working perfectly.

I now need to apply this same logic, but allow a duplicate to be entered if the last entry was made 24 hours in the past.

How can I check if the duplicate form entry is older than 24 hours and if so bypass the validation allowing a user to submit a lead.

Would applying a date filter to the original filter property be sufficent?

$atts['filter'] = "$fieldName=$fieldValue&&submit_time>last month";