Present invention relates to an entrance system (10) comprising a control arrangement (20) for controlling the automatic door operator (30). The entrance system (10) is configured to operate in any one of the following states: an opening state (OPS) wherein the one or more movable door members (D1 . . . Dm) are moving between the closed position and the opened position towards the opened position; a closing state (CLS) wherein the one or more movable door members (D1 . . . Dm) are moving between the opened position and the closed position towards the closed position. The control arrangement is configured to receive an opening command prompting the entrance system to be in the opened state (OS) and in response to the opening command, control the automatic door operator (30) to cause the entrance system (10) to switch to the opened state (OS) and select a first predetermined keep open time (TK1) as a current keep open time (TC) for which the entrance system shall be kept in the opened state (OS) and receive sensor data from the at least one sensor (S1 . . . Sn) and in response to the sensor data indicating that no person or object is passing through the entrance system, select a second predetermined keep open time (TK2) as the current keep open time (TC). Present invention further relates to a control arrangement for an entrance system (10) and a method for operating said entrance system (10).