Your technician should discuss with you the adhesive used and the time it takes for it to properly bond the auto glass to your vehicle. This lets you make an informed decision as to when you feel the car is automobile windshield chip repair safe to drive.
If you live where it snows, consider what ice, snow, salt, and loose gravel can do to your car. The radiator can corrode without you even knowing it, minor scratches and nicks can turn rusty, and the windshield is subjected to the extremes of interior heat and exterior cold. These factors, and others, affect your vehicle when the weather changes from winter cold to summer hot.
Driving the car immediately after a windshield repair is not something you can do. There is a time period that should be allowed to make sure that the window has settled and dried. The warmer weather allows for the adhesives to dry quickly. However, the colder weather increases the time that is needed before you resume driving. Taking the time to wait for the adhesives to be at full strength could mean the difference between life and death or an accident that leaves you maimed.
One more repair that can set you behind financially if you don't get done right away is windshield repair. A lot of times our windshields get cracks or chips from road debris that kicks up on the road. If the damaged windshield is taken in for repair promptly, it can be repaired. However if you wait too long you will have to end up buying and replacement windshield and paying to have it installed which is much more costly than a simply repair. Also some shops will offer a mobile service where they will come to you to repair your windshield.
If the crack looks exactly the same when completed, it's very likely the technician didn't inject the resin properly. A properly completed repair with cause each area of the damage to disappear from at least from one angle of vision (ex: looking from one side, looking from below, looking from above, etc.).
Not all chips and cracks can be repaired when windshield damage occurs. It is definitely worth the time to have any damage evaluated by a professional to avoid further cracking and damage and eventual replacement.