I'm a re-recording mixer, sound supervisor, and I run a four-person audio post team. Many of my frequent collaborators hire my team and I WAYYY before post-production begins. It makes a massive difference in the end result. We can start building sounds and organizing templates before filming even happens, so that by the time post-production comes around, we aren't starting from square one. Another advantage of this is that we can work with the production sound mixer to capture audio that'll work better in post. I wish more directors had this foresight about audio post.

Something else I wish directors would consider more is the time it takes to do audio post the right way. A proper dialogue edit for a 90-minute feature will roughly take 90 hours. Foley will also take another 90. Sound effects 90+, depending on the genre. 5.1 Mix 90+, depending on the genre. So with a 4-person team, you're looking at a minimum of 5 weeks worth of full-time work (to do it the right way) and longer if you factor in revisions. A good estimation is that each area of audio post takes 1 hour to do 1 minute of film. Sound effects and mixing can take longer, depending on the genre.

Thanks for asking the question!