Never Miss Another Deadline - Tips for Staying Focused and Getting Ahead
In the real world, deadlines are law. Turning something in late means it doesn't get published, and you don't get paid. Timeliness may not always be rewarded, but the consequences for not being able to keep up with deadlines are severe - especially if whether or not you get picked for a writing job depends on recommendations from people you have written for previously.
Never submit something late again.