If we are talking about the duration between the first day when the Earth was created and the sixth day when Adam and Eve were created and whether or not that duration is equal to five literal days according to the Bible, then I'd say the scriptural support is 9.99999999999 on that scale - for an older Earth.
The reason why it's not 10 is that the Bible doesn't define anywhere that those five days don't happen to be 24 hours long each. It does define the seventh day as lasting until the resurrection of Christ, the "day" we are currently in as starting with the resurrection, and the last day, the day of eternity, lasts literally forever.
2 Peter 3:18 NASB but grow in the grace and knowledge of our Lord and Savior Jesus Christ. To Him be the glory, both now and to the day of eternity. Amen.
The original Greek includes the word for "day" even though the KJV skips it. The NASB, which is considered a more literal translation than the KJV, includes it.