How much does insulation installer make?

I recently got to work at the lounge I'm living in during vacation, the tradie not here and so the owner asked me to do the work because he really need things to be done. For a 25m2 it takes about 3h and rest to be done. I just did it in 1h each louge and finished 4 lounges, and got paid $600. It's a small town where it's hard to get tradie and people to do the work fast. This is my first time doing insulation, I find it quite rewarding and looking to become a contractor. I'm not sure if this is true normal rate, or I'm fast or over paid, any opinions?

Edit: 16-Jan-2024: for those who wants to know more, this is a ceiling job, I was doing this in at lunch as well, and it's summer time, but in South Island not too hot. After the job my clothes covered in sweat. And yes I indeed got pay $600 for 4h work. It's insulation wool, 4R and all materials are paid, I got all the protective gears on, my whole body were covered. A bit itchy afterward