As little as possible. Don't know what the labor rate is in your area.
Hope you get dinner with that. That's about 2 1/2 times what I would charge. Took me about 6 hrs to do mine and I had to drive home from the shop twice to do the welding.I might be getting somewhere soon. I spoke to a guy who said he thinks he can do pretty easy.
A custom bike shop wants $250 to make bracket and take off my old and install new exhuast... Seems high.
Most shops are trying to get $75+ an hour here in Ma