Disability parking in a 2P zone

Just want to make sure I got this right, on this site: https://www.nsw.gov.au/driving-boating-and-transport/driver-and-rider-licences/health-conditions-and-disability/mobility-parking-permits/using-your-permit

It states: If a sign post is more than 30 minutes, you can park for as long as you want.

So in a regular 2P sign saying 9am-5pm for example, you can park all day if you have to? Or does it need to have the disability sign on the post as well.