OK - I don't see how I can avoid giving this away - I'm originally from Canada. In the past 5 years, I've probably made 15-20 trips to Canada to visit family because I can drive there in a few hours. None of those trips would be more than 10 days and they certainly don't add up to 6 months (even across all 5 years).
The trouble is that the application requests that I itemize the trips with start/end dates. I didn't keep track of this information and it would be very difficult to reconstruct accurately.
I wonder if the INS would be so kind as to supply me with what they know about my travels. I know where I've crossed by land and there haven't been any air travel trips outside the country.
Has anyone else been in this boat? Any suggestions?
Thanks in advance!

