http://dustloop.com/guides/bbcs/systemGuide/systemGuide.html#attackLevel
Hitstun (Crouching) = Standing Hit Stun + 2
Blockstun (Air) = Standing Blockstun + 2
Instant Block Blocktun (Ground) = Blockstun - 5
Instant Block Blocktun (Air) = Air Blockstun - 10
Barrier Guard Blockstun = Blockstun + 1