How Much Does It Cost To Have My Watch Regulated

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my watch is off 40 seconds a day slow which is unacceptable according to the -4/+6 rule. Anyway everywhere I call they want to do a service on it, my watch just had service recently so it doesn't need service, the peope service just suck at regulating the time. Is it possible to get a shop to do regulating the time only without trying to convicing me to do a full service. What will the price for rregulating the watch can I expect. I am in Southern California area