A film that is developed for 3 minutes must be fixed for how many minutes?

In the context of film development, proper timing for fixing the film is essential to ensure optimal results. After developing a film for a specific duration, it typically requires a fixing time that is at least twice the development time. This allows the fixer to effectively remove unexposed and undeveloped silver halide crystals, making the image stable and ready for viewing.

Given that the film is developed for 3 minutes, following the standard guideline of fixing for double the development time leads to a fixing duration of 6 minutes. This is consistent with best practices in photographic processing, where fixing time is crucial for the longevity and quality of the image. Thus, fixing for 6 minutes ensures that the film is adequately processed and preserved.