Hmm,
Let's try this. What if you SSH into your host using PuTTY and configure PuTTY to log its results -> Session -> Logging set a path. Then, we can try using the -C switch and set it for a large amount so that you are able to get more than 60 seconds. There is also a Seconds Switch but that wasnt really do much for me.. I set it to 5 and it clearly went past 5. That switch is -G 5 (replace 5 with any number..)
See if this gets your more than 60 seconds.
tcpdump-uw -c 100000000000000000000000000