Methods, devices and a computer-readable medium are disclosed for an uplink transmission opportunity in a high-efficiency wireless local-area network (HEW) are disclosed. A HEW station is disclosed that may include circuitry configured to receive a trigger frame with a first duration from a HEW master station, determine a second duration based on the first duration, generate a packet with the second duration, and transmit the packet with the second duration in an uplink transmission opportunity to the master station in accordance with at least one from the following group: orthogonal frequency division multiple-access and multiple-user multiple-input multiple-output. The trigger frame may include a resource map and the HEW station may transmit the packet on a channel indicated in the resource map. The second duration may be indicated in a legacy portion of the packet. The second duration may extend to one short interframe space before an acknowledgement of the packet.