Yup bog standard door - modern tubular style latch - 2nd fixing a new build.
30 mins sounds about right - I have watched him do it... He does not bother with jigs etc, but could knock out hinge rebates with a chisel in a couple of mins each! The latch rebate about the same, and then you need a couple of holes with an auger bit.Indeed - refitting into a used non square lining takes much longer.