We recommend choosing a handle that comes in various sizes so that drawers over 25" can have a single wider handle. Two handles usually require two hands to open them, even with soft close runners. I'd suggest a 12" handle for this size drawer. They come in 3", 5", 7", 9" and 12" sizes.
Some people like the look of two handles and it is also less expensive to buy the smaller sizes.
Taylor Made Cabinets, Leominster MA