E270 CDi Auto Gear Change Revs

I have booked my E270 CDi in for a Gearbox oil change on Thursday at my local Independant Merc garage, just got the vehicle last week its got 52k on the clock full History, but with all the cars I get I prefer prevention to cure, my question is what are your engine idle revs and how quickly does your E270change from 1st to 2nd, my idle revs are around 850 rpm and the change from first to second is about 1800 revs, is this normal? I would like this change to occur sooner, the specialist says that they will reset the Autobox on the Star Machine once the Oil has been renewed, any tips or advice welcome.

Thanks Dale