Reading from the book of:
25.M.g Reduced Availability Situations
A reserve pilot shall be available for assignment notification during his notification window, except as follows:
i. CRS may release a reserve pilot for a specified period of time during a reserve period.
While I haven't done R24 in awhile, every scheduler I've dealt with has been pretty reasonable about cutting me some slack. At the same time, I try to avoid being unavailable during the two prime assignment windows in the afternoon, and not much reason for me to ask to be released in the AM during the night launch.
I am not going to not mow the lawn just because I am on R24 and must be available. I am not going to not go to a movie just because I am on R24 and might not catch the call.
I am going to give my scheduler a call, see if anything's going on, and ask him or her to work with me. And if they want me to call them back, happy to do so.
But, in my experience with R24, pretty much all of the trip assigments have been assigned in the 30-37 hour prior range (barring the bad deal hub turn following the required call within 30 min)