Excellent banner if you want a nice souvenir to Vienna in your scanner without it taking up too much time you would normally use to explore and enjoy this beautiful city outside of Ingress.
In Prime you need to refer to the mission list here on IM for coordinates to mission 14. No amount of scrolling made it show up in my scanner.
This is mainly due to some distance between the (current) end (due to some dropped portals) and subsequent start portal and Prime's currently borked mission sorting.
I estimate i took about 1hr and 20 minutes for this banner. Did it at midnight on a Sunday to Monday. Walked at a normal speed (for me but i'm 1,97m), occasionally destroying and capping.
Couple of hard to reach portals around CS on some phones, otherwise very nice banner to do when you have a few hours to spare.
Keep an eye on WP's close to portals. Might accidentally hack in wrong order and have to use hs or wait 5 mins.