For maps 2, 3 and 4 just one try, but for map 1 I needed five or six tries XD
I think I'll farm ?-4 instead start 8-X on campaign, a good amount of gifts (as a collector you'll never have enough gifts), decent money and gacha, and gacha means more money (sell 2*) and pray RGN for some 3* and 4* to complete the album.