if you are using a stick burner I would think that you would want to keep larger pieces; however, if using charcoal - then smaller pieces are ideal to throw onto the coals. I'd try to let it age at least 5-6 months if cut into smaller pieces. 10-12 months for logs.
CMJ - KCBS
CBJ - MBN, NCBS, NCPC
OBJ - BBQCritic.com
CTC - KCBS
Pitmaster and chef - "4 Lil' Pigs" Competition BBQ Team
Author of "A 'Q' Review"
Lang Hybrid Smoker, BDS, Holland "Epic"