Depends on what it is(how involved the installation is), but the least you’d pay nowadays here is $550 per session.

Keep in mind, most of the time when it comes to this, the owner as already spent a pile of money and numerous wasted trips to the track trying to get the cars performance to improve.
The system they’ve been using to make decisions on how or what to try next hasn’t been working for them....... so they’re looking for a different approach.

It’s no different than someone bringing you some ported heads and asking if you can make them any better.
You’d flow them before you started working on them, right?