I often ask how

I often ask how many hours I do one job) it's always interesting, why) but the answer is: sketches: 40 min -2,5 hours. Works on the format 30 * 40 and 35 * 45 - from 7 hours to 3 days. Works on sheets and large macro - from 2 days and up. How much time do you spend on painting?) Do you know how to switch from one job to another? I'm extremely rare. I need focus on a particular picture.