Canadian citizen wondering about B2 visa

[inheaven]

Even tho Canadian citizen does not require to apply for a visa to enter US for pleasure purpose at the moment
i was wondering if that serves the same as a B2 visa, does the 6months time limit apply every single time i enter the US boarder or does it stack up?
for example, the last time i spent about 1month, the next time i enter US, does it mean i only have 5month left or does i still have 6month?

thanks

 

[waitin_toolong]

canadian visitors enter through visa waiver mechanism for tourism purposes and TN for employment.

The time is not cumulative but independant at each visit.

My memory tells me max is 90 days each visit and there is some time limit for the year