be protracted

See: endure, last
References in classic literature ?
To remedy this grievance, it was provided by a statute in the reign of Charles II, that the intermissions should not be protracted beyond a period of three years.
It is a received and well-founded maxim, that where no other circumstances affect the case, the greater the power is, the shorter ought to be its duration; and, conversely, the smaller the power, the more safely may its duration be protracted.