I use neo4j 1.9.4, i store 28M nodes, 267M properties and 157M relationships.
the neostore.* files :
-rw-r--r-- 1 user wheel 10961964959 7 fév 09:58 ne
Actually the nodestore is not instantly compacted after you delete nodes. Instead if you create new nodes they will reclaim the previously deleted ares with in nodestore.