A robotic work tool system (200), comprising a charging station (210), a boundary wire (250), a signal generator (240) for generating and transmitting a signal through said boundary wire (250) for demarcating a work area (205) and a robotic work tool (100), said robotic work tool (100) comprising a cutting blade (160) and a motor (165) for driving the cutting blade (160), the robotic work tool (100) being configured to determine a cutting load being exerted on the cutting blade (160) indicating a height of grass in the work area (205) and adapt a work schedule according to said cutting load prior to a next work session, wherein said work schedule includes a cutting height and/or a cutting time.
