I received the in-person interview invitation less than 24 hours (Apr 18 Thursday) before the interview(Apr 19 9:30am Friday). That was such a sudden. Thus I chose to reschedule it to next Tuesday(Apr 23 2:30pm), the time they suggested. But I send a lot of emails and didn't get any reply from them even before I arrived at the company in Cambridge and the interview started. I arrived at Cambridge at 8 am in the morning for the interview at 2:30pm but still received no reply of interview confirmation. When I arrived at the company, one of the colleague told me that the HR is not in the company and will come soon. I wait until 2:45 and had an interview of only 10 minutes (but it took me a whole day to travel to Cambridge and back). Immediately after the interview, the HR jumped into her car and left again. I was even walking down the stairs at the same time when I saw her driving her car away, even though I got out of their office before her. The interview didn't ask too much about me and told me about it is a fully commission-based position. Only 10 minutes. Done.