Sidelink synchronization facilitates providing timing reference for sidelink communications, including the transmitting of sidelink messages and/or the receiving of sidelink messages. Receive beams and transmission beams may change due to a change in the position and/or orientation of the transmitting wireless device. An apparatus for wireless communication at a wireless device determines a variable duration for a SLSS. The apparatus transmits the SLSS using the variable duration determined by the wireless device.