Quiz format changes - another reader poll!

I've looked through the remaining pages of my now-famous desk calendar, and there is one more sciency quiz left!

In the quizzes I've done so far, I've kept the comments completely open but asked that people submit only one answer per commenter per hour. There's always lots of very entertaining banter and trash-talk when we do it that way, BUT:

1) someone always fails to read the rules and posts multiple answers in one comment;
2) people in other time zones always moan at me that all the answers were gone by the time they got there.


So, for the remaining quiz (and any others that I may come across or invent myself in the future), I'll leave it up to my readers to decide on the format. I see two basic alternatives to the status quo:

a) increasing the shut-out time, or
b) switching on comment moderation for that post only, letting people answer as many questions as they can while the comments are hidden, and approving all comments after a 24 hour period so everyone can see all the answers at once.

The drawback to the former approach is that quizzes could drag on for days...

The drawback to the latter approach is that we'll lose the real-time trash talk and banter...

but I'll let you guys decide if it's worth it.

The results of the following poll will be binding, unless someone suggests another alternative in the comments that I think is better than all the listed options, at which point I will shout "screw democracy!" and use that format. You have one week to submit your answer, and will not be allowed to moan once the decision is made :) 

What format should we use for all future quizzes?