I vote for twice a year. I have a lot of fun during fourth wall events and seconding Cobra here, they're spaced far enough apart for it to give players the chance to participate in one instead of waiting for a whole year.

I do think it would be good if we could still have other things going on during November and May though; having the fourth wall as the main plot for the month seems kind of like a waste. I think it would be interesting if we could actually learn more about what causes fourth wall ICly - I wouldn't mind having a plot devoted to that to take up the month there. But as it stands, fourth wall doesn't do much outside of provide a fun distraction for a weekend. I think a lot more could be done with it in terms of what our characters can find out ICly.

One of the issues I'm having with my characters is that the rumor regarding the Gym Badges has been proved to be wrong; they can't return home even if they get all the Badges and the Elite Four isn't open to take challengers. Having some other rumored way to get home would be interesting and would provide something for the characters to investigate. I think fourth wall would be a good way to open up another option there - perhaps someone can find out that there is some kind of machine behind it, or even that Team Rocket has something to do with it. Either way, I think it would give the characters something else to look towards.

Of course that's just my opinion and it has... nothing to do with the original topic here, whoops.

But yes, I'd like to keep it twice a year!