I'm pretty sure I'm not the only one that has been angry because of not knowing the excact rendertime (in "Render to screen) because of antialiasing. Therefor, I've created this little formula so you can calculate it :) First of all... Render a thumbnail of the picture. The maximum hight/length must be 200 px. Then : (hight of the fullsizeimage * length of the fullsizeimage) / (hight of thumbnail * length of thumbnail) * Rendertime of thumnail (in seconds to get the accurate result. For example : 4,12 min. = 252 sec) / 60 = Rendertime of fullsize image :) I hope you can understand the formula :) - Thomas