I2C bus speed for Grove Sunlight Sensor

I am considering building a sunlight sensor with the Grove SI1145 and a Raspberry Pi 0 W. Since I will need to place the sensor on the roof and would like to place the pi inside the house, can anyone tell me the communication protocol packet size on the I2C bus for this device. To enable running a long wire, I am considering running the bus at 10KHz. Just not sure at this speed, how often I can get a reading update from the sensor.