Sorry for the cut off post lol..
I had one with baby #2. It worked on the left side but not the right. It lasted 3/4 of the labor. Then I felt everything. I screamed at everyon
Ive had 2 out of 3 deliveries. The first was successful. I got it at 5 cm and it worked till baby was born. But my 2nd was horrible. I got it at 4cm and it wore off. I felt everything. By the time i had to push i felt every contraction. And all the pain of pushing baby out.
Mine lasted from when I was 6cm till I delivered. Once they shut it off it takes about an hour to get feeling back. If I'm remembering correctly. This is #4 for me, last one and have plans to do unmediated :)