Their rules are very tedious and I’d have to go look them up regarding days etc. However they can operate on what is called a ‘legislative day’ and that can extend beyond what we would consider a 24 hour day. Also they can go into recess for some period of time subject to call, etc.
This may occur but I think Reid is trying to negotiate some other appointments with the WH. If it does occur it won’t be nothing more than perfunctory actions to satisfy the requirements of the rules.
If there was a Senator with balls enough to do this, as soon as the Senate adjourned the President could make his recess appointments before Dingy Harry could get his hangers-on back to the hill.