My RIS I primaried with 1056, which went from 1.109 to 1.038, then I added the Old Ale slurry, which dropped it to 1.025 at the time that I kegged it (which was 5 months combined primary and secondary). It may have continued to drop in the keezer, but probably not by much, and it was pretty good at that gravity.
My Old Ale, which got a 2000ml starter of 9097, went from 1.107 to 1.018 over the course of 12 months combined fermentation.