Some demonstrative embodiments include apparatuses, devices, systems and methods of beamforming. For example, a first wireless station may process transmission of a first plurality of Beam Refinement Phase (BRP) frames to a second wireless station during a BRP, one or more duration fields of one or more respective BRP frames of the first plurality of BRP frames being according to an end time; and may process reception of a second plurality of BRP frames from the second wireless station during the BRP, one or more duration fields of one or more respective BRP frames of the second plurality of BRP frames being according to the end time.