LL modification question

Say I have a JC LL with a return time from 10-11. I realize at 10:45 I won’t be able to make it by then. At that point am I able to modify the LL or can you only do that prior to the LL window opening?


You can still modify it, I believe right up until the end of the return window, or 11 in your case.


Also, the Grace period is actually 119 minutes.