Although you are going to sail in the cyclone season--they seldom get as low down as your intended route
. Even so--you will be at sea for about two weeks--maybe a bit more or less depending on the winds, but in a vessel your size you will be both cramped and uncomfortable. One of the problems on very small boats is the need to carry some safety equipment
, spares, drogues etc and adequate food
. The Tasman sea is not a place to be taken lightly. I would not myself be trying it in anything less than thirty feet--but that is me. If your vessel is seaworthy
enough--and you have a cast iron constitution, size may not be so important.