19". I can 4-table without overlap and 6-table without massive overlap. I tried 12 with the cascade option last night (so I just make decisions as they pop up). Jury's still out on whether that's profitable, pretty much broke even at it, but made 2 mistakes, one a big one where I misread the board and didn't see the pair and pushed my flush draw the whole way, and one where I was clicking on a table and another one popped up and I accidentally minraised with J4 PF. So bad mistakes cost me about $5.20 at $10NL (even with a board pair, boat over nut flush was gonna take some of my money). 483x360 is the approximate minimum size of a Samsung 30'' Monitor - FPP Store
This would fit 20 (5x4) with absolutely no overlap. Or I think I saw it cost about $400 for a monitor that would handle 12 (4x3) with no problem, the catalog I saw didn't have one with the resolution to handle anything better.