Roughly 8 miles of hiking and 4 miles of pack-rafting or canoeing. Route begins near Carr's canoe rentals at Round Spring at the signpost that states it's the beginning of the CRC. You then hike roughly 4 miles from there to Echo Bluff State Park. Then you hike another roughly 4 miles to Current River State Park. At the river, you'll begin your roughly 4-mile float back to the put-in road behind Carr's canoe rental, where the route ends.
Note: To do this unsupported you must carry your water craft (pack raft) from the start. You can also stash a canoe at the river - that would be self supported or supported.