This is the single most common misunderstanding in the trade and it is worth being plain about.
One cycle is one full open and one full close. A household that uses the door seven times a day gets through 10,000 cycles in about three years and ten months. A household that uses it twice a day gets over thirteen years from the identical spring. Same part, same warranty, same quality — three times the calendar life, because it did a third of the work.
So if a spring in a busy house fails inside four years, that is not a defective part. It is a part that was specified for a lighter duty than your house gives it. The answer is a high-cycle spring, rated at 25,000 cycles or more, which uses heavier wire and a longer body and typically lasts two to three times as long in the same house.
Tell us how many times a day the door runs and we will quote both options with the cycle rating of each. Any technician who cannot tell you the rating of the spring they are fitting is not measuring anything.