Hey, how many arms did Robin use to hold Odz's arm back? Was it the standard 100 or did she actually use more this time?
Well, it's possible that her limit isn't the 100 arms, but rather the strain from using the "cien fleur" for flying. Arms holding each other together doesn't really allow for much structural strength in that configuration. Arms just grasping each other to form a rope should be much less strain.
In any case, it doesn't look like she was holding down the arm for more than the cien fleur flying limit of 5 seconds. They took the ogre down fast.