[aucontraire]

You are entitled to 5 minutes (paid) break per hour worked in a shift, which the employer has the right to consolidate in various (but not endless) ways. This is on top the right to a lunch break which has separate rules. I think that both of these are is in the labour law and not allowed to substantially re-negotiated. (Many things across the various labour laws are explicitly allowed to be overridden by CBA).