Short answer: it depends.
If you haven’t set a deadline when creating an invitation [link], the candidate will automatically receive a reminder.
If you have set a deadline for when the tests should be completed, the candidate will receive an email 3 days and 1 day before the deadline.
Don’t remember if you set a deadline? You can check this by going to the project page and opening the “Invitation” tab. Under the “Duration” column, you’ll see whether a deadline has been set and when it is.
If a deadline is set, the email the candidate receives will look similar to the one below.
