The MB rotors have a service thickness and a repair thickness. It is very unlikely they warped from heat unless they were worn out when the brake job was done. Any competent mechanic can check for the thickness. If lug bolts were over torque, it could warp rotors. There is no time or mileage limit, only thickness. You should have your whole front-end checked by a professional if you cannot do it yourself.

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Steve
1985 Mercedes 500SL Euro (Gray market)
1995 BMW 520i Euro (Gray market)
1992 BMW 525it Wagon
1994 Honda Del Sol Si