Looking at a ticket from Rotorua to Blenheim and the ANZ website shows a flight connecting in Wellington, but with only a +20 minute connection. Does anyone know if this is a reasonable connection and what their terminal is like for such short connections?

I assume by the flight being booked via the ANZ.com website that its a legal connection, but worried a bit about bags and more importantly "me" making the connection.....any info would be appreciated.....thanks!