Does anyone know how long a 'normal' programme on a Neff dishwasher should take? I have a Neff integrated model S44E43NOGB and the thing seems to run for hours before finishing. I've had a Neff before and I don't think it took this long. I don't want to ask for a service visit if there's nothing wrong but it's occured to me that the machine might be getting stuck and running the programme twice. Many thanks.