Live orchestra is always faster especially for extensive film cues. Depending on how extensive the cue, you can do 2 minutes or more of music per day with the focus on the writing.
A cue is different from a complex orchestral score like Rite of Spring or what Frank Zappa mentioned. In a recording session for a film score, you're governed in the US by how many minutes can be recorded in a 3-hour session.
A concert situation is different. Here, only so much time is available. If you're a major composer, you can get the rehearsal time. If you're not a major composer, the issue is simply getting a performance of the work, in which case, you're probably better off doing it yourself.