Not something I'd know of the top of my head but if I had to guess I'd say it's way more than your 12. Probably wouldn't surprise me if I've folded like 30+ in one table. When playing multiple tables, especially in early stages of tournaments you should be folding most of your hands anyway so it's nothing of concern. If playing one table I guess you can take those slightly +ev calls than you would otherwise fold if multi tabling.
For example, if playing multiple tables and I've looked at my stats they vary massively on each table I'm playing. I've ran really, really nitty in some tournaments early stages like 8/10 and in others if you get the right spots to call/raise/limp behind etc and I can run 45/40 for example it just depends on the players at the table and the spots you can get. The more aggro your table is early stages the tighter your range should be, where as if you have a really tight table you should be playing more loosely etc. Just do the opposite of what the table average is doing and you should be fine.
Just to note though, opening A5s EP due to frustration of folding so many hands isn't going to be good in general. There's no incentive to try stealing when there are no antes in play, sure A5s plays ok post flop but I'd probably still fold this hand and probably open a suited connector as opposed to raggy aces in EP. Chances are if called you're likely going to be dominated and have to play OOP with a hand that's not even going to be fun to play if you flop top pair and get some action.