"It lasts from fifty to sixty-five minutes."
Translation:Trvá to od padesáti do šedesáti pěti minut.
We need to learn how the numerals decline. Have a look at the Tips and Notes, for example, for the Numbers 2 skill: https://www.duolingo.com/skill/cs/Numbers-2/tips-and-notes
It depends whether you refer to something concrete like "the movie", "the game" and it is already in the context, then you do not need "to", because you can insert "ten film", "ta hra" into the sentence and it will have the same meaning.
If you are just generally bored in some situation and there is no clear subject that could be inserted, you need to use "to".