SRTs vs. hourly shop rate

Shops bill for their labor hours using either Standard Repair Times, by establishing their own estimated repair times, or actual technician repair time.
Truck makers, component suppliers and even third party publishers offer SRT guides to help establish acceptable times for specific repairs. Standard repair times for a specific repair can vary based on what method the source used to develop the standard. In addition, manufactures typically have a separate SRT established for their dealer warranty time reimbursement.
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Source:: http://fleetowner.com/ideaxchange/srts-vs-hourly-shop-rate