App review process (testflight): In review for a long time

Yesterday at 6 pm I uploaded my beta build for review and it's status was waiting for review. This morning the status had changes to "In review" but now, 13h later it's still "In review". I will update this post if my app build had been approved.

EDIT: A day later in the morning it was approved. The total proces from uploading to being reviewed took 1 and a half days.

To submit a new build of an app for review, the current build must be removed from review. This sets the status to Developer Rejected, which is equivalent to a review rejection. Once you have changed the build, you can submit it for review once again, which will put it at the back of the queue.

Removing a build removes your app version from Apple’s review queue and changes its status to Developer Rejected. When you resubmit your app, the review process starts over from the beginning.

^{Source: iTunes Connect Developer Guide - Viewing and Changing Your App’s Status and Availability - Removing a Build from Review}