Our I-130 has been approved and we're waiting on it to be
sent to NVC. I have been looking through threads about this
and also at the DS-230 that my husband will fill out. It says at
the bottom of the 230, part I to list everytime that he has visited or
resided in the U.S.. He lives in Canada and for most of the last 30 years
in Windsor which is right over the border from Detroit. He has crossed
tons of times to go visit friends for lunch, go to Ann Arbor for the weekend,
etc. It is totally impossible for us to know each and every time he crossed.
What do we do? Put the times we can think of that were for a significant
period of time (vacations etc.), times he came to visit me? I don't know what
to do in this case. If we can't come up with each and every time are they going
to deny us? This worries me.

I have noted in past posts in this situation where 'many entries' has been put on the form regarding this question. The just put the dates to/from. Any significant ones remembered can be listed seperately. Im sure someone that has had this experience will be able to share with you what they did.

Seeing as how CAnada and the US are so close together, they understand that Canadians probably make frequent trips to the United States...

From what I can remember, I put all the major trips I could remember and then put something along the lines that between this year and that year I made multiple trips to the US....

Many thanks to you both. I panicked yesterday when I saw that. My husband has
lived there for 31 years and we knew there was no way to remember it all. You've both
made me feel a lot better.

I wrote something like 'numerous trips from childhood to present for vacations, day trips, family visits, shopping, scientific meetings, trips to the post office, etc., none exceeding six months'.