Some of the guests indicated that they'd attend only the ceremony, so I wanted to do a receiving line. But then, I was thinking about how long it would take. We will have about 100 guests at the ceremony. How long would it take to do a receiving line? I will probably only have my FI, I, and our parents in the line. Reception is also at the same place, and I don't want guests to wait more than 45 minutes to start the reception. I'll need to do family portrait (~20 minutes) between the ceremony and reception, so I was wondering....