Forgive me if I am posting in the wrong place. I have a problem dealing with thermal conductivity. I have an aluminum plate, approx. 12 in/ long, and 1.5 in. x 4 in on the end which is being applied with 200 W. What I'm interested in is how long it will take before the plate reaches a thermal steady state. I've never done problems in thermodynamics before so I hope I'm using the right terms. I want to know the time it will take for the plate to reach its max temperature. How do I find this? I'm not sure what equations to use. I realize that environmental conditions factor in so it's a somewhat difficult problem but if anyone can lead me in the right direction I would appreciate the help very much.