I was trying to figure out a problem with the LJ-SEC tool, and I found something interesting.
I have nearly 8,000 entries. When the LJ-SEC tool tries to use syncitems with no start date, the call times out.
EDIT: After investigation, the problem was not the number of entries, but a result of using the LJ built-in Edit Journal Privacy tool. For more details please refer to this post.
Just wanted to report this behavior somewhere in case it's undesirable. In the meantime I'm looking into other, more incremental, ways to get a journal's history.