I followed what AqualandPlus did to their anubias. I'm guessing it would take months or half a year to get some good bushing back.
So far, mine's 2 weeks in and just starting to grow tiny stalks where the leaves will come out. Also it already has 2 baby leaves. Most of the rhizomes looks good and healthy but a couple of the rhizome cutouts seems to be melting/mushing up on me.