Hi Lan,
This definitely sounds like something is going wrong somewhere. While the reconciliation process can take some time, I wouldn't expect it to take 12 hours for 203 terms. Can you share some more information to help us understand what is happening
What version of OpenRefine are you using?
What Reconciliation service are you using?
Is there any information you can share from the console / terminal window (on Windows and Linux you'll have the terminal open whenever you run OpenRefine, but if you are running OpenRefine on Mac you'll need to follow the "run OpenRefine using Terminal" instructions at
https://docs.openrefine.org/manual/running)
That might help us understand what is going on here
Best wishes
Owen