So can you really only do a partial pause? If they are still doing Senate work could the Democrats theoreticlly all show up one day and pass a bunch of stuff without the Republicans given that they are not actually in recess?
Majority of Senators have to be there for the Senate to conduct business. Otherwise, 1 Republican can show up and ask for a quorum call and everything stops until they can get 50 senators there. So what would happen, in this instance, would be 47 Dems show up and can't do anything without 3 more Republicans, and any Republicans that came in would immediately ask for a quorum call which would give the rest of the Republicans enough time to show up as well.