no just do it once, they need a few days recovery...If your going to do it again they should be much bigger then the last time...if you are talking giant bushes then whatever just give a few days
Give it time and watch how the plant goes. By taking the main top off it slows its upward growth there and the lower side branches catch up so now they all are at the top height. If your going to veg a long time you can keep doing this to each top as they get to the top height. Its one method you can also super crop which is where in veg you pinch and slightly roll the tops at the stem and them fall over and this allows the side branches to do the same as the pinch one takes time to heal . This gets done in sog and scrog alot to keep canapy same levels for even light coverage and more bud sites.