Playing at a desk
A desk gives you the whole grid at once. That helps on harder bands, where you scan boxes and lines together.
Mouse or keys, same rules. Notes are still worth using. A larger screen does not replace reading the board.
A longer sit is fine. So is ten minutes. Time is private. Nothing on the site asks you to go faster.
Play, leave, Continue. The desk is just a quieter place to see the grid. Solved lists what you finished in this browser. Home is the menu.