Just starting the review can take a while. However, engineers who might be reviewing code instead of other activities may be providing more value/higher velocit

Just starting the review can take a while. However, engineers who might be reviewing code instead of other activities may be providing more value/higher velocity/better quality with those other tasks than breaking to just review a PR. Someone once argued to me that each feature PR should have very few surprises if the feature has been planned and communicated well with affected parties before implementation even begins. The opposite is often true in some organizations.