It’s possible to learn basic Photoshop operations in 5-10 hours, but to learn anything more complicated or to get very good or efficient at it, it could take up to 50 or 100 hours. It’s important to invest time into the software and understand it properly, otherwise, your images won’t turn out quite the way you want. You can learn shortcuts and you can do a thing or two here and there to get the job done, but in the long run, it’s worth investing the time it takes to learn the tools properly.