790. When may an Avel take a break?
It is obligatory for aveilim (mourners [within the first seven days]) to sit on very low chairs or on the floor, but they do not have to be sitting the entire time and they may intermittently stand or walk around. However, when menachamim (those who come to offer comfort) are present, the avel should remain seated.
According to the strict halachah the menachamim should also be sitting on a low stool, unless the avel is moichel (forgiving [of his honor]) and indicates permission for the visitors to sit on regular chairs. However, since sitting on a low chair is only for the honor of the avel, the assumption is that the avel is moichel them for sitting on seats of regular height—and this is the general custom today.
If the avel wishes to stand up or walk out of the room, poskim say that express mechilah should be asked from the menachamim. A constant flow of visitors and using a low chair or the floor as seating for hours on end can, after all, be strenuous. It is reasonable for the avel to stretch their legs, or even leave the room for a bit. Yet, it is still preferable that before taking a break, the avel ask the visitors if they don’t mind.