system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] How painful would it actually be to be eaten by the Sarlacc?

Jabba says that it'll cause you unbearable pain for a millennia, but I'm assuming (and hoping) this is an exaggeration. Obviously it'd be painful, but how long would you be suffering.
gpt
Depends on your idea of painful. In legends the sarlacc will physically bond and merge into it's prey. A meal will be kept alive and fed nutrients for possibly years as the sarlacc uses it's victims to process the raw materials it's "roots" pull in. Once the prey dies of old age the corpse is broken down and recycled through other living prey trapped in the stomachs. Over time the victims become the stomach lining and intestines of a sarlacc processing it's food in a symbiotic relationship of sorts. 

While most animals process thoughts and emotions the same as a sarlacc they're only vaguely aware of the true horror that's happening as their body becomes one with the sarlacc. The reason the pain and torture can last a thousand years is because the mind of victims are merged as well as the body. The mind of a victim is pulled into the sarlaccs and becomes a part of the creature. 

For a brief time the victim is aware of their body wasting away and being slowly fed to other victims, but they're unable to lose sensation or lose consciousness or "die". The sarlacc slowly feeds of their mind but this process takes a very long time. Usually long after the victims physical body is gone their mind is slowly being torn apart memory by memory as it gets lost in the sarlacc's neural pathways. It's a slow creeping madness as your body wastes away and you feel every nerve dying until all you feel is the beast's own hunger overwhelming every thought of your own. Eventually oblivion overtakes your mind but it could take years or centuries for some species to find release from the agony.  

Given a strong will and an appropriate amount a time a victim can momentarily take control of the beast's body and influence it. But it's rare to keep your mind when it's a few drops of rain compared to the ocean of memory and animal instincts that is the sarlacc's mind. It is possible for an old enough sarlacc fed enough sapients to begin approaching sapience itself. Only one was known to come this close and was killed before any tests could be confirmed however.