In my .pcap file captured in WLAN, I am getting current packet duration (given by wlan_radio.duration filter) more than the difference between the capture times of current and next packets, which I calculate by subtracting the values of frame.time_relative of the two packets. How come is it possible? If such a thing happened, it will mean that the first packet was still being captured when the next packet arrived. So, which one is correct: the duration field displayed by the Wireshark, or the packet capture times?