There's a couple of ways I can think of to accomplish this! First you'll need to have a Last Modified Time field inspecting either the record or a specific field, depending on your needs. Then, you could:
Create a view with the filter "Where Last Modified Timeisnumber of days ago 2." Create an automation with the trigger "When a record enters a view" and the action "Send email,"
You could also create a formula field that reads, for example:
This will return "Send Email" if the difference in days between when the record or field was last modified was and today is greater than or equal to 2 days. From there, create an automation with the trigger "When a record matches the conditions" and set the conditions to this field returning "Send Email", with the action of "Send email."
For some reason, I've occasionally noticed that DATETIME_DIFF requires a modifier or + or - 1 when formatted to days, so just something to be mindful of if you want to go that route. Hope this helps!