According to an embodiment of the present invention, a method for transmitting a frame by a station (STA) in a wireless LAN system supporting a high efficiency physical layer protocol data unit (HE PPDU) comprises the steps of: configuring a first duration field included in an HE-SIG A field; and transmitting a frame including the HE-SIG A field and an MAC header, wherein the first duration field may be configured to indicate a transmission opportunity (TXOP) value using a number of bits smaller than that of a second duration field included in the MAC header, and a granularity of a time unit used in the first duration field in order to indicate the TXOP value may be configured to be different from a granularity of a time unit used in the second duration field.