It’s important to remember that your effective date only matters if your claim is approved by VA. If your claim is denied, you will receive no benefits regardless of the effective date.
The amount of time it takes VA to pay out benefits depends on a number of factors. Everything from the severity of your condition to the quality of your claim can affect how long you have to wait for a claim decision. Once the claim is finally decided and the rating shows up on va.gov —assuming it’s approved—you should receive your first check within 15 days.