My research isn't clear on this, though it seems to be reported it would be only once a season.
If grown as a lawn alternative: One of Dichondra's many attractions is that it requires LESS frequent mowing than lawn grasses. It will look neater, however, if mowed at least every two weeks and this will also help to control weeds. Set your mower to a height of 1.5 to 2.0 inches during summer months. Close cutting (3/4 inch) when temperatures are cool encourages dense small leaved turf. Don't' remove too much growth at any one cutting or when you wait too long to mow.