[avl999]

It is more about being unblocked than however long it takes for the PR to be merged in even if it is really fast. It is not always possible to pair/mod on a change.

Getting folks to quickly review PRs is difficult as doing so breaks the flow state of other people and results in constant thrashing and context switching between the work they are doing are reviewing PRs.

Even if the team is committed to quickly reviewing PRs, you are always going to have times when a bunch of people are in a meeting, while a couple are at lunch and a couple are knee deep in another issue and no one can look at your PRs for hours and you need to keep yourself unblocked.