100% depends on your viewing distance. I use 2 27" monitors and I sit about 2-1/2 to 3 feet from my the screen. I’d go smaller if I sat any closer. Also have a 47" lcd screen above them. Tried playing wow it once. Big nope. 
100% depends on your viewing distance. I use 2 27" monitors and I sit about 2-1/2 to 3 feet from my the screen. I’d go smaller if I sat any closer. Also have a 47" lcd screen above them. Tried playing wow it once. Big nope.