I figure the timeline is as follows
- Fett is eaten by the Almighty Sarlaac
- Within a few weeks or even days, Fett kills and, or at least escapes the Almighty Sarlaac. He is badly injured, unconscious, dying on the sands from the deed.
- Jawas come for any useful scrap from the sail barge wreckage. They also strip the immobile and barely conscious Fett.
- Sandpeople find Fett and bring him home, caring for him until he recovers
- Recovery takes awhile