I just found a brief mention - it didn't specify how many to take, although again, I assume you'd only take one since this isn't a daily pill but a weekly pill. I know with Alesse, you'd take 5 for a "morning after" emergency type situation.
Personally, if you're having sex weekly or biweekly, I feel you'd be better off just using it as prescribed. Even morning after solutions have been known to fail.