It depends on the company. Most companies want some form of inspection and that is usually the hold up. If the agent is nearby they will try to inspect the property quickly to get the policy issued. Getting a policy issued can take an hour or a week, depends on the agent and the company.
Here are some things to consider:
A policy has to be quoted, accepted, and then bound or issued. Give yourself time for that and ask the agent how long these steps will take.
Some companies need money to bind and some will bill you or get their payment from closing.
Some agents cannot bind the policy and everything has to be sent to the company underwriters to bind.
Most policies require money or the promise of money, inspection of exterior, and a signed application.
This list is not conclusion but does provide some idea of the process. It is always better to start researching as early as possible so you are not put in a position where you are ready to close on your home and the insurance is holding up the finalization of your home purchase.
The Home Insurance Specialists
What is the peril or cause of loss that creates the structural failure? I can tell u their is no generic structural failure. Need more info in other words. If u r concerned that the structure may fail because of the age of the support system I can tell u no matter what state u r in no insurance company is going to provide coverage. I have been an insurance agent in CA for over 12 years. I do applaud u for getting a structural engineer. In Ca earth movement is never covered. If we are talking about a sloping issue insurance can be difficult to place because while earth movement is excluded for your structure the damage it can cause to another structure is not excluded from liability. In CA again... Hope I have helped....And yes, ask an experienced insurance agent.... more