Question re: Constructive Discharge

I understand Constructive Discharge (CD) to be a possible consideration when a boss/employer changes or makes working conditions so unbearable the employee has no choice but to quit - there can be a finding for the "wronged" employee.

My question is in regard to a different time frame. If 'miserable' working conditions or situations have existed for many years, does the continued annual signing of a contract year after year during that time suggest on-going acceptance of those conditions? Is it possible for a person to pursue CD after, say, a decade of such conditions - that s/he has finally reached a "breaking point" and can't take it anymore?

Thanks.