Price for balancing the tyres

Hello together, after I have bought a manual tire replacement machine from Gaither and so that I myself have raised the new tires in order to save as much as possible, I want to have the four wheels balanced out by the workshop, because this cannot be done without the use of the expensive tire balancing machine itself. I therefore wonder what kind of work can be required by the tyre fitter. I also wanted to know how lukewarm, or better to say: how many minutes so much a job can be done. The workshops usually have their fixed prices, which however include tyre assembly. The costs for intermediate activities, such as balancing, are not apparent. Can the workshops therefore at all exaggerate and only demand the price for balancing, which includes the complete work, among other things, tyre assembly? Many greetings