What are some things and techniques I can do to minimize the time it takes for my apps/updates to be approved for the App Store? Do smaller updates generally take less time, and
Take a look Apple review support
Once you've submitted your app for review, you can view its status in the My Apps section of iTunes Connect or on the iTunes Connect App for iPhone and iPad. Review times may vary by app. On average, 50% of apps are reviewed in 24 hours and over 90% are reviewed in 48 hours. If your submission is incomplete, review times may be further delayed or your app may be rejected. Once your app has been reviewed, its status will be updated and you will be notified.