Has anyone visited the Berlin Wall Memorial arrived early enough to see part of the outdoor exhibits before the visitors' center opens at 10:00? I want us to start one of our days there, but I do not want to rush the rest of the day. Would starting say at 9:00 or 9:30 make sense, or is the introductory information from the visitors' center vital to the experience? I guess what I am asking is how best to visit the Memorial, even if we do not begin at the visitors' center. Is 1.5 hours sufficient, assuming we do not do a deep dive at every part?
Also, it looks like there are codes (QR codes?) for audio guides along the way. Are these helpful? It would be nice not to worry about chasing down an audio guide.