The deadlines provided include learning time, submitting the project and passing corrections. Therefore if you submitted the project but haven't done needed corrections and the deadline is due - you will receive notifications.
You should therefore always aim to have some time left (~3 days is a good minimum number) in case you do not succeed in your first correction.
We also strongly recommend aiming for a pace that is faster than the minimum - if you attempt to finish the sprints just in time for the deadlines, it’s quite likely that you will miss one at some point.
As a guideline, not having a correction scheduled for a project when there’s a week or less left before a deadline should be a warning sign for you that your pace might be too slow.
More info about the deadlines.