I've got a mat at home, for my high desk. Sometimes at work. Then you can stand for longer, definitely. Once you've had a while to get used to it. It's like exercise, when you've used your muscles for a long time. If you just exercise every now and then, you tend to get tired faster. Your muscles ache or you feel it in your calves. But otherwise, I think the mat can have a supportive effect. You can stand more comfortably and for longer.