Charmed Season 10 will be 22 issues long

Pat Shand confirmed this on Tumblr:

Anonymous asked: Hi Pat, has it been confirmed that season 10 will have 22 issues or is it still uncertain? Sorry if it has been asked before, I couldn't find a definite answer.

Pat Shand: I don’t think I’ve said it definitively yet, but here we go: it’ll be 22 issues for sure. X