It varies. A+ Content approval can take up to seven days, but we have also seen content approved within a matter of hours. Keep an eye on the status of your content within Seller Central.
Occasionally A+ Content can be rejected and this is usually down to making claims that fall outside of Amazon’s policies. Avoid using promotional wording such as “best product ever”, or incentivized keywords such as “free”. These policies are not always easy to follow and they can be applied in a way that is not intuitive. For example, we had an A+ page rejected initially because it used “gluten free” instead of “gluten-free”.