Yep, I also have this problem. The only (wired) headphones that are big enough to fully circumvent your ears and thus comfortably sit for an hour or more, is the Sennheiser HD 558. Unfortunately, it's wired.
There doesn't seem to be a bluetooth alternative. The newer Sennheiser models like the 4.50 are not as big as the HD 558. There's a dongle-based wireless headphone, the Logitech G533 which is big enough. It's meant more for gaming, and looks like it. It may only work on Windows, though.
There doesn't seem to be a bluetooth alternative. The newer Sennheiser models like the 4.50 are not as big as the HD 558. There's a dongle-based wireless headphone, the Logitech G533 which is big enough. It's meant more for gaming, and looks like it. It may only work on Windows, though.