Easter suburb, about 30-40 mins drive from city, unless you take the freeway which would make it around 25 mins. I grew up in the area - very hilly, close to the mountain ranges, green. Nice schools. I have many friends who live in the area, and public transport makes it pretty accessible. YOu can also see maps compared to the CBD at
whereis.com - Unsupported browser if you search "wantirna" -> "get a map" -> zoom out.