Hi Liam,As of now we can count days with a workaround by counting total seconds in between two selected dates and then divide the total number by 86400.This is very easy to achieve with just 4 questions and a couple of calculations.
In the third question, please select 'Seconds' as precision which is very important. This can be changed under question property.
On the 4th question, click on properties and under Calculation builder please select 3rd question 'Count seconds' and divide it by 68400.
This should display the total number of days on the question 'Total Days'
Please let me know if you have any other questions or concerns.