Ms Office - 10+years up to presentAutoCad- 10+years up to presentSketch-up - 6+years up to presentV-ray - 3+years up to presentRevit- 5+years up to presentLumion- 2 years3dMax- less than a yearDesigning- 4+years up to presentWorking Drawings (Architectural, Electrical, Plumbing/Sanitary, Mechanical)3d Modelling (Autocad, Sketchup, Revit, Lumion)