Price on valve adj

Was quoted $550
For labor

I bought all the parts for the job

Hes really clean and cleans all parts when putting back in
Valve covers etc etc

But for
Timing belt, serpintine belts, hydro tensioner, pulleys, water pump, gasket set, valve cover gasket and spark plugs
Thermostat and the seals,
also changing oil and coolant

$550
You tell me??

Im confused cause friend said id be paying too much