Justin Taylor has a fantastic article on the Biblical Reasons to Doubt the Creation Days Were 24-Hour Periods. I personally don’t think that they were but I’ve never put a ton of weight on one interpretation or another. One thing I hate about discussing the topic is the way that people who believe them to have been 24-hour days treat those who believe differently as if they’re unbelievers, or ignorant of Scripture, or deceived by science, or interpretive acrobats. Taylor lays out a number of well-reasoned biblical arguments for doubting that the days were 24-hour periods and he does so as a devout believer and a biblical inerrantist. Well done!