Nechomah, you are right, but as CTL says, sometimes there is no choice.
I remember once when I decided to try a different country for dating purposes for several weeks. I spoke to many shadchanim and anyone I knew in the area, checked out lots of possibilities and had one date for sure set up before I got there, and other possibles. By the time the first did not work out, I had others being set up. I actually got into trouble once- I went out with one guy and was sure he was not for me and said no to the shadchan. Then I went and called the next shadchan to set up the next one. After that was arranged, the first shadchan called me back to reconsider my no; basically she made me go out again against my better judgment. So here I was for the first time dating two guys at once! I felt horrible about it, but I figured that I was only going out again to please the shadchan, and would concentrate on the second guy. Turns out the second guy did not work out at all, and the next date with the first guy was better, and we ended up going out several more times before we decided no. So marathon dating can be problematic, but I can say that all’s well that ends well, because I went back home and eventually did meet my husband there.