>>2584805Infinity. Focus shouldn't be a problem if you are using a wide focal lenght. Everything should be in focus after a few meters or less anyway. I don't sharpen my landscape too much and if I do I do it in photoshop, duplicating the layer, setting blend mode to over lay and apply a high pass till it looks not overdone.
I shoot from a tripod with delay mirror mode just in case and trigger with Infrared from my phone