Here is my breakdown of the repair process for aircraft.

First, everyone stands around looking at it for a little bit

Then someone finally goes and gets a measuring tape and figures out the damages location using station numbers.

Next would depend on the manufacturers SRM (structural repair manual). If they have a repair in the manual, you can just use that to do everything. If not, you'll need an engineering document telling you how to repair it. If I had to guess, the repairs to the stringers and frame were covered in the SRM, and engineering chimed in for the skin replacement.

Then, you drill out all the rivets necessary for the repair and carefully cut the leading edge.

Drill/cut out damaged sections of stringers and frame. Add doublers where required.

You grab some sheet metal the correct thickness and cut it out to the correct size. You can probably pick up a good bit of the holes from the old skin but will need to get creative for the rest. I usually use thin plexiglass.

Countersink the holes, prime the parts, slap some sealant on the joints, and shoot it on. Paint if you're feeling fancy.

Then an absolute shit pile of sign offs and paperwork.

2-4 days depending on how much time you're throwing and it and availability of parts. You could probably do it in 24 hours but you would have to really go after it.