1. The problem statement, all variables and given/known data A cylinder made out of AL 6061-T5, dimensions d 10mm, L 28mm. Is put into an oven pre-heated to 100 deg C. How long will it take for the cylinder to reach 100 deg C ? 2. Relevant equations None given, this is not a homework question or even material I have been taught. I have found a Nusselt equation in form of: Nu = C.(Gr.Pr)n.K 3. The attempt at a solution Nusselt equation gave me a number of 1500 hours.