Canada-US Plan - Maxumum number of days in the US?

[narfit]

I have a current Canada-US plan and will be travelling to the US for six months. Is there a maximum number of days for out-of-country use? Could I be cut-off at some point?

[NFtoBC]

Although there is not a maximum number of days, there may be a fair use expectation. The bulk of usage is expected to be in Canada, so I would confirm before expecting it to be seamless for a six month period.