0595名無しさん@英語勉強中 (US 0Hdf-gKiJ)
2017/12/13(水) 15:17:31.54ID:nhtFpNS4HI'm an American, and I can understand about 90% of the first guy, 100% of the narrator, and 100% of the second guy.
The understanding isn't perfect; some of the words I couldn't give you a definition of, but given the context I can fill in the blanks and get a good idea of what was the intention.
I've found that English speakers generally can understand a wide range of accents, but really thick ones that have a unique lexicon and morphology can require getting used to.
For example, I had a professor in university that had a really thick Indian accent which I could not understand for about two weeks, but
after having classes with him for that amount of time I could start to make sense of what he was saying.