For me, it depends on the type of problems you are trying to solve. If you and competitors are fighting side by side to achieve a goal and get a piece of the pi

For me, it depends on the type of problems you are trying to solve. If you and competitors are fighting side by side to achieve a goal and get a piece of the pie, it's OK I don't believe in overworking, I believe in steering the work in the wrong direction. Staying at your desk just to attend a meeting, working without feeling like you are contributing much, these things are productivity killers, not the other way around IMHO