Entry is determinred by CBP, not CIS, so there si little value in what CIS says on this.
The NAFTA handbook on B1 entry (since this is business visitor entry, and better be described as such when spreaking to the offcier), can be for upto one year;
http://spatialnews.geocomm.com/features ... ftahan.pdfThis is the CBP manual, and has all the citations you need.
But, not that it is *can* be allowed in. Typically, the CBP will not admit for 1 year at a time, and unless you have an I-94 that gives you that year, you are considered undocumented B1, which is six months only (The CBP officer who posts on this board may confirm that I-94s in B-1 are or are not given for more than six months, I recall him saying that they are only six months currently.)
So, in your predicament, having entered undocumented for business purposes, you can't stay more than six months per stay.
and, yes, it is always maximum six months per stay, not total days of all stays. Those limits come from other factors, like tax and provincial healthcare issues.
I would also be looking at the activities that you were sent down to perform (given the firms lack of immigration knowledge) and see if you are indeed performing legal B-1 work (that is also described in the handbook).