I view code reviews as a good opportunity for learning but I've one particular grievance with them. Specifically, when I'm asked to code review a pull request that's alarmingly huge (i.e. touches more than a dozen files, +1000 LOC changes, etc).

I've never come up with a bullet-proof way to deal with this. The situation usually ends up with me providing a rubber stamp of approval and making some caveat commentary about "uncertainties" due to my inability to devote so much time to be rigorous. I feel bad every time I've got to do this.

The problem might be exacerbated at another level too. For features, stories might not be broken down enough.