Usually 2 x's week, sometimes just once...I really like the DC way to do it...nice and slow on the negative. Talk about a good burn! My calves recover very quickly, so I like to beat them up really good.
but your a big boy, t3c is not quite as large. I use to be his size...... i put most of my calf size on just from getting heavier like the other guy said...... frequency... when my calves became frequent to walking around everyday with a lot more weight. they responded well. i only train them once or twice a week not doing more than 3 sets each workout. calves like moderate reps with heavy weight, and i mean heavy, you should be doing at least double your bodyweight on standing calf raises from the first time you train them.
I work calves twice a week also. Between sets I jump on my toes as high as I can...from side to side and just straight up and down until they burn so bad that I have to stop. Then I hit the next set.