I looked into a very reputable place installing one for me... They said 1-2 hours to install it @ $65/hr.... but they were doing mounting and soldering the wires and everything. Not a cheapo job. Depends on how good you want to get.
Then they also wanted $100 for the first hour and $65 for the succeeding hours to dyno tune it.... which they said 1-2 hours for. I think that might be an overquote. If you don't have more than just basic breathing mods, most shops can dial it right in very quickly.