It's possible you're thinking of:
* "Cytherea" (1924): This is a silent film based on the novel by William Henry Hudson. However, its runtime is not easily found online.
* "Cytherea" (1978): This is an American made-for-television drama film, but again, the runtime is not readily available.
If you can provide more context, like the year of release or the director, I might be able to help you find the runtime of the film you're looking for.