Question about h1b application form

The form has a section ask me to list all the period I stayed out of U.S. during my TN1 visa period, the problem is that I go back to Canada about every 2 weeks, (I am canadian holds TN1, works in NYC, but live in Toronto), so if I list all the periods I stayed in Canada, that would be alot. Should I list all my stay out of U.S.? Thanks for your help