Computing readable media, apparatuses, and methods for signaling UL frame duration in wireless local-area networks. An apparatus of a wireless device is disclosed. The apparatus comprising processing circuitry, the processing circuitry configured to: encode a trigger frame for an uplink (UL) multi-user (MU) communication, the trigger frame including a media access control (MAC) portion including one or more station identifications and a length field to indicate an UL physical layer convergence procedure (PLCP) protocol data unit (PPDU) (UL-PPDU) length, the MAC portion further including a duration field to indicate a time period for other stations to set network allocation vectors. The processing circuitry further configured to: configure the access point to transmit the trigger frame, and decode UL-PPDUs from one or more stations identified by the one or more stations identifications, where a length of each of the UL-PPDUs is to be in accordance with the UL-PPDU length.