Depends on your environment. If you can't get to 58% rh..... hang whole plant to slow down the process, it's not going to hurt anything even if it takes 18 days or more for it to dry. It's all about slowing it down, and you do that by a cool environment,(65 degrees or so) and 58-60% rh during the first week.. you can then drop your rh to 53-55 for another week or more if hanging whole. Airflow should be minimal. You just want to see the hangers barley moving around. No direct air on them. ... just a slow flow moving around.
Branches will dry faster.... and I prefer this myself to cut down the possibility of mold during the dry process.