@mattb violinist who played in youth and non professional orchestras for quite a few years (grade 8) - a good orchestra only needs a conductor to start them off, unless the price is hairily complex, say, very abstract or John Williams (who’s music is fab but so complex).
When doing a pre-concert venue rehearsal conductor would regularly start us off and then walk to the back of the hall to listen to the balance of the music.
That said, I probably spent 25% of my time as lead second violin watching the conductor, and the remaining 75% looking at the music. In fact when paying in a duet I would often close my eyes to truly listen to my partner. But that’s just me.
You can’t spend too much time on the conductor because you probably don’t know the music off by heart.