A small but big mistake

Now it is 18:00. I made a small but big mistake.
I watch one TV drama every Tuesday,
and today it will have the final episode.

Usually this drama finishes at 22:00,
but tonight it will finish at 22:20.
However, my DVD recorder will record only until 22:00 as usual.

I don't want to miss the final episode......
Especially the ending is the most important!

Oh, what should I do?