If you have Tim Ernst's OHT Guide, then you could plan to hike Sections 1-3 for a total of approximately 57 miles, starting at Lake Ft. Smith and ending at Lick's Branch TH. Sections 2 and 3 have some of the most awesome views of the entire OHT.
Now for the bad news. Northern Arkansas recently experienced some of the worse ice storms in recent years. This has caused massive amounts of downed trees and limbs. The OHT has experienced its fair share of this type of damage. The Forest Service has closed all designated campsites until further notice.
The OHT is opened, but it will be extremely difficult going in places. Check out the OHTA website and www.hikearkansas.com for the latest information.