I recorded this when Summer Event was going to end in an hour and I still had to burn through 20 teapots. I ended up using them all with 20 minutes to spare, and each run was around 1:40, give or take.
As you already know, Summer 2022 Event introduced the first Lv90++ Free Quest with a 1/1/1 enemy comp. With the assumption that they will continue this trend for future event, this was basically my attempt to see how consistent I could farm such node with crit facecard farming.
This used to be a privilege of a few Buster Servants only, however, with the release of Summer Skadi, most Quick Servants can now also enjoy this method of farming as long as they have 2~3 Buster cards in their deck. This is most likely what Lasengle wanted you to use Summer Skadi for instead of Quick NP Looping (which she can also do, obviously).
Just beware that without Summer BB insurance, the consistency of this farming method will drop a fair bit.
#fgo