Review is not a formality at the end of a build. A large part of the checklist describes
The requirements checklist is public and substantially architectural — read it before building, not before submitting.
The common rejection causes are consistent: mandatory webhooks, billing edge cases, an onboarding a reviewer cannot complete, and code injected into themes.
Reviewers install your app on a fresh store with no data, which is the state most developers never test.
Resubmission costs calendar time you cannot compress, which matters most when a launch date has been announced.
It varies, and the number that hurts is not the first review but the round trip after a rejection.
The full guide has the formats, the deadlines and the worked examples.