Upvote:2
This answer is purely anecdotal and will have to be independently verified. But since we have no better info as yet, this is what I have learned:
The Chinese consulate in Mexico City seems only to issue 30-day entries and not longer, but does issue dual-entry as well as single-entry visas. The forms also include multiple-entry but as I've learned at three other Chinese embassies, just because it's on the form doesn't mean they issue those.
I thought I was requesting a single 90-day entry in the appropriate part of the form, but the receipt I was given to pick up my passport indicated a single 30-day entry.
When I went back to the consulate to ask about it the security guards assured me that only 30-day entries were granted and seemed to think I was confused about the difference between two or more entries adding up to 60 or 90 days. They did not let me back in to ask the consulate staff.
Had I known of this limitation in advance I may have instead chosen to book two 30-day entries and booked my flight out of China for a different date.
Hopefully somebody with better knowledge of the actual rules can add a more concrete answer at some point.