thanks colin . im pretty much a beginner when it comes to this business so all the input is appreciated[I'm alway to cheap on internal cleans(or so it seems on here) yes there will be40 sides to clean but should take more than 1-2 mins eachTo clean so no more than 80-90 min job So 45 is right for me. Builders clean would be more, But I'm sure dome one will say double at least that I say